Question about HP Compaq Evo n800c Notebook

6 Answers

Incomplete Boot-up of Compaq Evo N800c running Windows XP Professional.

The unit developed this problem after it was shut down in Stand-by mode by closing the lid. Even with the lid closed, it kept repeatedly starting-up and shutting down. This continued even after the AC adapter was removed. Finally the laptop battery had to be removed to stop this repeated momentary starting-up and shutting-down of the unit, as holding down the “Power button” (to force complete shut-down) was ineffective. The current behavior of the unit is summarized below.

  1. The unit typically starts-up on plugging-in the AC Adapter into the DC Power jack on the rear, WITHOUT even pressing the Power button, and typically shuts down in a FEW SECONDS, usually just on reaching the Compaq logo screen - which displays the Name(email), Contact(Phone no.), and F10=ROM-based Set-up.
  2. If while starting-up (as described in point 1 above), the Power button is repeatedly pressed, together with a few clicks of the F10 key, the unit SOMETIMES proceeds to the ROM-based “Computer set-up” screen and remains ‘ON’ for at least FEW MINUTES, so I’m able to go through most of the Menus of the ROM-based “Computer set-up”, and I’m even able to make some changes in the settings. This included making changes in the settings under “Boot Options” and “Device Options”, of the “Advanced” menu, just to see what all was possible.
  3. From the ROM-based “Computer set-up”, it is also possible to run the HDD Self-Test Options, and the QUICK (2 minute) test usually completes successfully, but the Comprehensive (36 minute) test does not complete successfully, as the unit typically shuts down on reaching 20-30% completion.
In case of Start-up with repeated pressing of the Power button, (as in point 2 above), but without any clicking of the F10 key, the unit SOMETIMES proceeds to a BLANK BLUE screen (with only the mouse cursor showing), and then shuts down within 3-4 minutes without reaching the Log-in screen.

Please advise urgently possible device failure and availability of any detailed component-level schematics for this laptop model.

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  • 8 more comments 
  • sohrabc Jan 07, 2008

    Thank you for your prompt reply.
    1. I checked the power button contacts, with a multimeter (with the unit off), and it seems to be ok, because the contacts open and close. Also, as per my post, when I'm able to enter the ROM-based "Computer Setup" by F10, the unit CONSISTENTLY remains on for quite a few minutes (at least for 5-6 mins.), so I don't think it could be a 'short'.
    2. I am not aware how the memory is to be checked, when the unit does not even complete boot-up. I did, however, remove the laptop's 256MB memory module to check it and replaced it back into it's slot, but there is no change in the unit's behavior.
    3. I am not in a position to replace the main board, as it will be difficult to source it locally.
    4. Thank you for the links to the schematics.

  • sohrabc Jan 07, 2008

    Thank you for your prompt reply.
    1. The fan works perfectly and I already cleaned up the vents just to be sure there is proper cooling.
    2. I have checked the power button with a multimeter (with the unit off) and the contacts seem to be opening and closing properly.
    3. The strange thing is that the unit remains on for at least 5-6 mins. whenever I am able to enter the ROM-based "Computer Set-up", as mentioned under points 2 and 3 of my post, as opposed to shutting down almost within 2-3 secs. when I plug-in the AC adapter. I wonder if that is indicative of the nature of the fault.

  • sohrabc Jan 07, 2008

    In continuation of my original post, I wish to re-emphasize the following:
    1. This problem developed on shutting-down the laptop in the STANDBY mode, which I normally never ever use.
    2. The unit shuts-down almost immediately, WITHIN 2-3 SECS. when I try to boot-up, either by plugging in the AC adapter, or sometimes by using the Power button, following shut-down from the incomplete boot-up (with the AC adapter already plugged-in). However, whenever I am able to enter the ROM-based "Computer Set-up" (enabled by using F10, while the unit is trying to boot-up),the unit CONTINUES TO REMAIN ON FOR AT LEAST 5-6 MINS., while I am exploring the different Menus of the "Computer Set-up". I have specifically pointed this out also in my original post, for whatever clue this might provide regarding my problem.

  • sohrabc Jan 10, 2008

    Thank you for your further recommendations. I am trying to get a laptop hard-drive enclosure which can be connected to a USB port to see if I can check it out on my desk-top machine. I hope that's possible to do, though I've never tried it before. However, I feel it may not be a problem with my hard-drive because even with the hard-drive removed, the unit behaves in exactly the same way as described in my original post and my subsequent comments. It seems to me to be a capacitor problem but I have no idea how I could find the defective capacitor and to identify the capacitors I should be checking, without detailed component-level schematics, which I have not yet been able to find, even from the 'fileshare' link you gave. I have been referring to the COMPAQ Maintenance and Service Guide for the EVO Notebook N800c, N800v, N800w series, for Removal and Replacement Procedures, for accessing the insides of the laptop, but it is not helpful for understanding the circuitry. Also, without any detailed component-level trouble-shooting guide which normally provide details of voltages at some of the important points, in different functional modes, I do not know which points I should be checking and what voltages I should be looking for. With the unit typically shutting down in just 2-3 secs. of powering-on, it's hardly possible to check anything. I shall get back to you after I manage to get the necessary hardware to check the drive in my desk-top, through the desk-top's USB port, as I believe that would be the only way I could do it without having another laptop to work with.

  • sohrabc Jan 10, 2008

    Thank you Smeago1 for your suggestions. I am unable to go into the 'Safe Mode' using the F8, which I had also already tried earlier. Only once before I had successfully managed to go into the ' Safe Mode' but even at that time I had a blank blue screen, with just 'Safe Mode' displayed in the 4 corners of the screen, and could not proceed to the Log-in screen. It remained like that for quite a few minutes (maybe about 10 minutes) before it once again shut-down.

    For upgrading my present 256MB RAM to 1GB or at least 512MB, I had been trying to get some compatible RAM locally but was unable to find one. At the time, I had removed the RAM card from it's slot to check the RAM make and Type No. This was ofcourse many months earlier, much before the current problem I am facing. I do not have the possibility of finding another laptop of the same make or other make from which I can pull out the RAM, to swap with my RAM. I will however continue to try and get another 256MB RAM module, to see if that is the problem, but it seems to me to be a capacitor problem, though I have no idea how I could locate the defective capacitor.

  • sohrabc Jan 10, 2008

    Considering my feedback on the various suggestions, and the somewhat limited capabilities with respect to testing, with just an analog multimeter, I would be grateful to receive additional assistance for resolving my problem. It would help if someone could perhaps pinpoint the possible defective component on my motherboard, which could be creating the kind of boot-up malfunction I am facing.

  • sohrabc Jan 15, 2008

    Thank you DARKLORD and others for your strong recommendation about defective hard disk. I finally managed to get a hard-drive enclosure with a USB port to check out my laptop's hard-disk on my desktop machine. I was much relieved to confirm that my hard-disk is working perfectly and I was able to access ALL my folders and files in both partitions of my 40GB Hitachi drive, which were separately identified as 'H' and 'I' on my desktop. I also ran the "Scan for and attempt recovery of bad sectors" test, under 'Check Disk options', for Error-checking in the 'Tools' tab of the 'Properties' window, for each drive partition. This also confirmed that my hard-drive was perfectly ok as the drive successfully completed all 4 phases of the test and gave a "Disk Check Complete" result for each partition.
    I guess now the only thing remaining is to somehow identify the defective power circuit on the main board, since there is no easy way to source a new compatible main board locally.
    If anyone can guide me to identify and check the possible faulty component in the power-circuit of my main board I would be grateful.

  • sohrabc Jan 16, 2008

    Soulvisitor Please refer my comments of Jan.15

  • sohrabc Jan 16, 2008

    Pauldonp Please refer my comments of Jan.15

  • sohrabc Jan 16, 2008

    Please refer to the LAST 2 sentences of my comments of Jan.15,2008 and suggest some way to identify the faulty component of the Power Circuit on my motherboard if you believe that could be the problem, after reading this entire thread.

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6 Answers

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The problem is definitly with the heating.
if the screen turns blue then system reboots its your PROCESSOR which is over heating may be your CPU exust dont work and now the system gets stuck.

Posted on Jan 16, 2008

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  • 1,113 Answers

Your problem is not a capacitor problem, that is so remote of a possibility it is it's a one in a million!

I Have read all the info here and find Darklord has already posed the correct solution (with explaination) 3 days ago,

Have you since verified hard drive and I'm just missing that fact?


Posted on Jan 10, 2008

  • Soulvisitor
    Soulvisitor Jan 16, 2008

    Great you have eliminated something, One doesn't normally do repairs on mother boards, due to multi layed construction and complexity of circuit



    I would stay on elimation trail and test alternate memory due to ease of job and common availabilty at cheap expense of memory compared to that of mother board, but I do agree that it may indeed be the main board, but I think you find one replaces it as the fix, rather than repairs it.



    Good luck

  • Soulvisitor
    Soulvisitor Jan 20, 2008

    HOw did you go? Please keep us informed

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Buy a newer one

Posted on Jan 10, 2008

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Hi there,

in my opinion it sounds like when you shut down in standby mode what the laptop does is it writes what ever info you have into ram so when you try to boot up again it tries to resume itself by reading from the RAM and then that's where your problem starts b/c it can't read the ram it shutsdown again.

I would do the following: when you first boot...just tap the f8 key to see if you can start windows into safe mode then just do some maintenance ie. chkdsk of the harddrive to make sure everything is ok then shutdown the computer properly and reboot the cross your finger.

If that fails then see if you can grab some sodimm ram from another laptop and swap it with yours to see if it boots up properly. to change the ram there's a compartment at the bottom of the laptop with a single screw in it. Just remove it and pull the ram out. Unless you have an onboard RAM then you are pretty much dead in the water. You should validate that its a ram problem by download ultimate boot cd with tools to test your ram and harddrive.

good luck

smeags.

Posted on Jan 07, 2008

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It simply Really, Your power button is shorthing out. Just poen it up and see if it broken or just slipped out of place.

If that doesnt solve the problem then th short is on the main board, you can fix it by soldering it or if you cant see it you might need to scrape some of the plastic coating of the board.

And the if thats ineffective then check your memory, if your memory is damaged it can cause similar problems.

Also you hard drive windows instillation can also be corrupted but thats very unlikely cause its still shutting down in the bios.

IF ALL ABOVE FAILS YOU NEED TO CHANGE YOUR MAIN BOARD

Posted on Jan 04, 2008

  • 9 more comments 
  • Rishi Roshan Ali Jan 04, 2008

    here is the links

  • Rishi Roshan Ali Jan 04, 2008
  • Rishi Roshan Ali Jan 04, 2008
  • Rishi Roshan Ali Jan 07, 2008

    Hi , from the nature of your problem i dont think its the power button shorting anymore as i originally did. Now shutting down the system in StandBy Mode will not have caused this problem.



    HERE IS WHAT IS HAPPENING

    1.)IF YOU ENTER THE BIOS YOU GET AT LEAST 5 to 6 Minutes RIGHT



    2.) IF YOU LET IT BOOT WITHOUT ENTERING THE BIOS YOU GET 2- 3 seconds



    IT CANT BE OVER HEATING CAUSE IT WOULDNT HAVE BEHAVED DIFFERENTLY IN THE BIOS



    IT CANT BE YOUR MEMORY CAUSE IT ISNT RANDOM



    IT CANT BE YOUR BOARD CAUSE IT IS NOT PERMENENT



    IT CANT BE THE PROCESSOR CAUSE IT ISNT RANDOM



    YOU HARD DRIVE ON THE OTHER HAND



    Upon powerup if you didnt enter the bios you system takes 2 to 3 seconds to load the hard drive operating system, which is roughly the same time your system shuts off.



    If you enterted the bios it will take a bit longer for the hard drive to heat up which will then shut your system down to prevent any damages to it.



    You will need to replace your harddrive, Please check yours on another system first to ensure it is dead, or try another harddrive in yours to ensure it is working. Chances are something caused the hard drive to be damaged and it might happen again. The only thing that could cause that is your mother board or power controll unit.



    If you are inclined enough that you may fix it your self,

    Open up the system

    Look at your adapter and verfy the amount of current it uses

    On the main board plug it in(with the adapter)

    using a multimeter do a contuinity test from the adapter port to the filter coils for the amount of current necessary. If the voltage verys you will need to replace the board if not look for defective componentd like capicators on the board. Continue a contuinity test to the harddrive port to ensure its the propper voltage.



    If all is well simply replace your hard drive and reinstall your operating system and thats it. You may be able to recover data of your last harddrive by using data recovery software.



    If you are unable to carry out the above test, i recommend you get a professional to have a look at it, no point in buying a hard drive and having it spiolt just as fast..



    please note i am not present there and i can only work with the information you have given and not there to physically examine it, but from what you have said IT IS YOUR HARD DRIVE.




  • Rishi Roshan Ali Jan 10, 2008

    DARH LORD tnt re read my post it has a detailed description on how to go about with the diagnosis

  • Rishi Roshan Ali Jan 10, 2008

    DARK LORD tnt re read my post it has a detailed description on how to go about with the diagnosis

  • Rishi Roshan Ali Jan 10, 2008

    BTW You can just try another harddrive and see if it works

  • Rishi Roshan Ali Jan 10, 2008

    BTW YOUR HARD DRIVE IS A RECTANGLE THING (BOUTH THE SIZE OF THE PALM OF YOUR HAND)


  • Rishi Roshan Ali Jan 11, 2008

    well THEN THE OLY OTHER THING TO CAUSE THIS IS A DEFECTIVE POWER CIRCUIT,,, TRY THE ABOVE METHOD TO SEE IF YOU CAN ISOLATE IT,,, IT ISNT A CAPICATOR OR IT WOULDNT HAVE BOOTED AT ALL,,, ITS A LOGIC CIRCUIT OR IC... NORMAL REPAIR PROCEEDURE = NEW MAIN BOARD

  • Rishi Roshan Ali Jan 16, 2008

    Then sir i am sory to say its deffinately an overeating proplem,, to verify this remove the top case, and reassempble without the case, place a fan normal household fan on the macine and run it.. It should stay on for a few minutes more..



    YOur heat sink distribution unit fan , your processor your cooling controll circuit any of these will need to be changed..

    You can try changing the fan yourself first and if that doesnt help if you are not qualified enough or knowenough about it to fix it your self then i suggest your see a technician and let him replace them for you.. LET ME KNOW WHAT HAPPENS

  • Rishi Roshan Ali Jan 16, 2008

    If it is the powercircuit on the main board (WHICH I STRONGLY DOUBTH) YOU WILL NOT HAVE ANY POWER AT ALL,, it could be the cooling or fan controll circuit but as you say the fan is working,, BUT IS IT WORKING AT 100% ?????????

    try the above method and let us know what you find out..

    BTW if that fails the only alternative left is a new main board since the problm will be caused by your graphics axcellator malfuncioning, or the SCI(output) manfunctioning, was it any other components it would not have even powerd on :(

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Hi it sounds like it could be one of couple problems either the laptop has over heated by the vents becoming blocked by dust or fluff as this builds up on laptops anyway as the vents are so small.
And if you are sure the battery charges ok then that will be ok the other problem could be with damaged on off button could be something jammed in it.
Can you hear if the fan is working or not and has it ever benn knocked about.
The other problem is the expensive one and that is if the hardrive has seized or this problem can occur by getting a virus.
But the first thing i would say it was without having it in front of me is the switch because no laptop should switch on when just plugged in as it does this then that is likely to be the problem.
If you can manage to source the part where you live and are able to remove and replace new one without damaging it further as they are difficult to work on but i think this should solve your problem.
If it was a problem with fan then it wouldnt switch of for 10 to 20 minutes so we can rule that out but try the switch first as its the cheapset option let me know if i can help you further

Posted on Jan 04, 2008

  • 1 more comment 
  • paul proctor Jan 07, 2008

    Hi after talking to my friend who works for well known pc firm he said that as you get shut down quicker when you boot win then takes longer to shut down when enter bios then the problem is deffinately your hd it is either going to be ciesed or got damaged during last shut down this can happen due to a power surge during shut down process as this can damage all data on the hd.
    So the best thing to do is replace this and then you should resume normal op.
    I also c DARKLORD1 has told you this as well so this is deffinately the route to take let us all know how you get on

  • paul proctor Jan 16, 2008

    hi just thought i tell you that you cant get the mother board itself repaired as they are so complex you would end up replacing most the components and then still wouldnt find the problem. is their anyway you can try another hd in your laptop to eliminate that i know youve said you tested it but that doesnt meen the registry programmes isnt damaged or has virus also if their is a virus out their that can affect the rom mem then the chances are you will never get the laptop working again as this is the registry that controlls how your laptop works and boots up.
    I wouldnt have thought that the problem is with the board it is more like a registry problem if you have tried another hd in your laptop and still same problem then i dont think it would work out financialy worth it on getting it repaired as the only option is replace the board.
    The only sollution left that would be financially worth it is to find second hand laptop say one advertise spares or repair you can often come across them on ebay and are relitively cheap than transfer your hd into it then you should be sorted.
    If the problem is with the board you will probably never find it unless its a water problem ie spilled something on laptop this would cause the problem your having but if you are sure this hasnt happened then you might never find the fault as the board is that complex most people wouldnt even think about repairing them as the chances of getting it wrong or never finding the fault is high.
    are you the only one who has acess to the laptop to rule out a third party spilling anything on it.
    Its very unlikely that the board wopuld just fail like this unless it got wet or overheated if overheating is the problem have you checked if the unit is cooling properly but if it was overeheatin then the laptop would still operate properly untill it got to hot and shut down.
    As the registry isnt loading properly then it has to be corrupt data let us know if you find anything else it then we can look again

  • paul proctor Jan 16, 2008

    Hi after going back through your posts i notice that this problem started as soon as you used the standby mode putting the laptop into stanby mode wouldnt cause anything to short or fail as it is only a programme on the rom but it does look like corrupt data on the rom mem if this is the case replacing the hd will make no difference to the problem you have neither would replacing the ram chips it does look like the problem is with the data on the rom this could have had this problem from new but maybe knowone has used the laptop in standby mode so this problem would not be known untill the first time in standby mode.
    The option i would choose is try buy second hand unit maybe you find one with no hd or ram inside then just transfer yours into it as your hd is probably fine as the standby data is stored in rom not on your hd.
    Can you still acess the rom based setup and choose the boot options set this to boot from hd first if you have done this let us know.
    If the laptop is getting no further than the compaq sign then your registry isnt loading the data from the hd so just check that boot order is hd first then let us know

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Posted on Jan 02, 2017

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SOURCE: compaq evo n800 laptop built-in wireless internet

right click "my computer", left click properties, select "Device Manager" Expand anything to do with "Network Adapters" and make sure there are no problems / exclamation marks / unknown devices.
If there are, look for your wireless driver on..
http://h20180.www2.hp.com/apps/Lookup?h_lang=en&h_cc=uk&cc=uk&h_page=hpcom&lang=en&h_client=S-A-R163-1&h_pagetype=s-002&h_query=compaq+evo+n800&submit=Go+%C2%BB
depending on your model. if this doesn't work go to www.hp.co.uk and download the driver then install it.
If you can't detect any wireless networks, make sure your wireless card is activated - I believe this involves holding down FN (bottom left of keyboard) while then pressing F2 key at top. after this try try to search for wirless access points points.

Good Luck,

Cheers,

Colin

Posted on Mar 18, 2009

  • 415 Answers

SOURCE: need the right wireless adaptor for the Compaq Evo n800c

It depends, do you have wireless capabilities on you modem or router, if you do yoy have a choice of wireless adapters. Either usb or pcmcia. You'll want one that is easy to hook up.
Mark

Posted on Mar 30, 2009

zenl
  • 34 Answers

SOURCE: Network problem with Compaq Evo N800c Laptop

you need to configure your Internet Protocol (IP) that synchronous the network. if you using WIFI you may need encryption code from your network provider.. beware on installing driver, it comes crashing in your machine.

Posted on Apr 09, 2009

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