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Computer Does not Boot correctly, Monitor is Black.

I've been trying to figure this one out for awhile now.
Ok here is the issue.
We are trying to get the computer to boot up, at least into Bios, but there is no Display(Monitor is black), Keyboard seems to have activity but unable to use(Numlock lock, cap lock etc does not work, but I Know that the motherboard knows It's there because when I unplug and plug the PC back in all three lights on the Keyboard flash once(The Numb Lock, Cap Lock and Scroll Lock lights).
Also, I Used a wireless Keyboard and the lights on it comes on, and every time I hit a key It's action light flashes(Which is normal). The Display does not come on at all, We tried the onboard video, A PCI-E Card and a PCI Card, nothing.
The DVD Drive seems to work, Hard Drive works, Mouse and Keyboard seems to work, at lease they get power, All fans work, all lights work, I Tried another monitor(same problem).
The Computer does one short beep. but that means nothing, I Took out the memory, unhooked the Harddrive and still it does one short beep.
I Resetted the bios by removing the Motherboard Jumper and placing it back on, I Tried a different battery, no Luck.
IT Doesn't seem like it's the motherboard, The only thing we can think of is not enough power?
We rechecked everything, everything seems ok.
Could a Bootup disk solve this Issue?
Thank you.

laxman, that's not really a solution?

In any case, it can't be an OS problem if this issue occurs during BIOS load.
From the time the power button is hit, there seems to be nothing going through to Video and Keyboard.

I've found this to be an intermittent problem, but almost always occuring after a crash like power failure etc.

This stinks of motherboard problems, but it would be interesting to see if anybody here manages to replace their motherboard(pref same model) to see if the problem still occurs.

I thought it might be gfx card as well, but it can't be, especially if it occurs whether you use onboard or periph.

any help welcome.

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  • 4 more comments 
  • DominiqueZA Jan 08, 2009

    very tricky, keyboard not detecting durng boot up, will find a ps/2 keyboard and try resetting bios. - will let you know



    also beginning to wonder if there's any stock in the mentionings about not enough power being available for peripherals during boot up...

  • DominiqueZA Jan 11, 2009

    I've gone and reset the BIOS in the meantime, bootup seems fine.



    I don't get any beeps during boot up, haven't for a looooong while come to think of it.



    I'll be monitoring things to see if the problem is still there, since it can't really be reproduced at this point.



    cables all look fine, pins all in place.

    gfx card is dual, and both plugin points look fine(worth noting that problem occured no matter which one i use)



    as i said, all i can do is wait to see if the problem has gone away, although this isn't really the way i like to solve problems. Best to know what the problem was to avoid in future.

  • Anonymous Jan 31, 2009

    I have been having an issue where my computer won't boot for the past month now. Got it up and running a couple of times and now just found that if my monitors are not powered on the computer boots right every time, if monitors are powered on computer gets stuck before loading windows. Also when monitors are on I couldn't boot from a floppy or CD. I think it could be a problem with the graphics card, but not sure. Any thoughts?

  • Axekick May 11, 2010

    I would be inclined to think it is your monitor cable but there is very little to go on and I am no expert.



    *Does it sound as if the computer's hard drive is fully booting to your operating system or not?



    * I think if your PSU is too small your computer will usually shut itself down rather than just failing to power any one specific thing.



    * When you tried the other monitor did your also try another monitor cable?



    * One short beep usually means it passed the initial diagnostic



    * Often you need to change your BIOS to change between PCI -PCI-E & AGP video modes so unless you are familiar with this BIOS you may not have yet eliminated the possibility of the video card.



    Again based on the information provided I would tend to think it is the monitor cable. Have you tested the monitor and cable on another system?



    I would recommend you open the case and disconnect everything, reseat the memory, remove the motherboard battery(again) then ensure all connections are clean and reconnect everything.



  • Kevin Nelson May 11, 2010

    What type of monitor are you using, crt or lcd? Have you tried using a spare monitor to see if there is a any video getting through?

  • Mark Robinson May 11, 2010

    have you tried resetting the bios ?

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Very interesting...Might try the following...
- Video. Yes, almost garuntee that it is either the video card/onboard or the cable. Look at the cable and cable connectors and see if one of the pins has been shoved in. This is common. Often, one will replace the cable and still have the problem because a pin has been shoved in on the mother board.
- Power. Remove everything from your computer except the keyboard and the monitor (yes, even the mouse) to eliminate any power drain issues. If you can, remove the DVD drive (unplug power and data bus cable).
- BIOS. One beep is good. You should be able to get into the BIOS setup no mater what other problems you are having. The BIOS uses a generic text, video and keyboard driver. If you aren't able to see ANYTHING after the beep then it is definately the route from the motherboard through the video card or onboard video, through the cable to the screen. You seem to be going through the right steps to debug but just haven't found it yet because it is something that you have dismissed as working...like the pins on the video connector. Go through your path again, this time look at anything that you have assumed that was working and suspect it as the issue.

Posted on Jan 08, 2009

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laxmankumar
  • 191 Answers

SOURCE: Computer Does not Boot correctly, Monitor is Black.

try to reinstall the OS..if it doesn't work then there would be a problem with ur motherboard becaouseof failure of IC's. So contact the service men.

Posted on Sep 27, 2008

  • 7 Answers

SOURCE: Computer Does not Boot correctly, Monitor is Black.

Hmm it seems to be problem with Power Supply, but still if you can give a try connecting your system into other socket may be which is properly grounded one.
if the above didn't fix your issue, i would suggest you to disassemble and then assemble it again. try changing the data cable as well..  Last option left is if you have a spare SMTP checkout with that.
Let me know if it works..!!

Posted on Mar 13, 2009

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