Won't boot, no POST.
Powers up for 3 seconds then shuts down about when you would expect a POST beep.
If I remove the RAM, it will power up and beep code for missing/bad RAM. I've tried unhooking everything possibe and resetting the CMOS, but removing the RAM seems the only way to have the power stay on for any length of time.
I also swapped with known good RAM and processor, but no difference.
Anybody have a clue?
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Re: am37 in an HP 304w
There are a few things we can do still:
-Make this as basic a machine as possible: remove any add in cards (except primary video card), unplug mice, remove all USB components, reduce the size of your memory (RAM) and if you have multiple hard drives remove all except your boot drive. Restart, does anything change?
-Verify the power switch is working correctly. It could be cutting out after a few seconds.
-Test the power supply or switch out with a know good. Lights and fans turning on is only a rough test, the power supply could be sending incorrect or unstable to the motherboard.
-When you turn your power on listen closely for any sounds like hard drives or fans starting up.
-What lead up to this event, did you upgrade or change anything? If yes double check your work.
-Try a keyboard you know works, I admit this is a desperation move but if you get this far we?re running out of things to try.
If none of this works *depending on the value of your PC* it might be worth a trip to the local repair shop. Among other things they will have something called a pre-boot test card that plugs into a PCI slot of your PC and will give you a much better diagnosis of what is going on. An evaluation should cost about $35 to $50 bucks. I know that sounds like a lot when you can buy a new motherboard for $50 but what you avoid is buying a new motherboard only to find out the problem is something else. I know a lot of people who spend a couple hundred dollars buying new parts all to avoid paying a tech to diagnose the problem.
At any rate if you have any other questions please let us know and please don?t forget to rate the posting.
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#1 on the list for this is shut down from over heat due to CPU fan not running or CPU overheat. Check to see if your CPU fan is turning on when your system is powering up. If its not.. thats your problem (get a new fan)... Even if it is it could mean the fan is not properly contacting the CPU with thermal paste. If this is the first time you\'ve powered the system up, your next step is to go out and get some thermal paste and put it under the CPU fan, if you\'ve been running the system and this problem just cropped up.. skip the thermal paste, its already there. #2 Next possibility is BIOs power settings are incompatible with your hardware. For example the frequency on the CPU is set higher then it can operate and its over heating. Some systems will automatically shut down and restart with default settings others you have to get into and set to default. can you get into BIOS? Can you reset your BIOS settings to defaults? Check your mother board manual. #3 A compenent is shorting out your system and needs to be replaced. Is the system posting prior to shutdown (beeping once on start up?) If its beeping more then once that means something else and you should read your manual. If its not beeping then its a short somewhere and you can bet you have a bad part in the system. To identify which part it is you can either disconnect things (RAM, Drives, vid card, PCI cards,ect) one at a time, attempting to start the system after each one or you can take everything but the bare bones out and try to start it. I usually take all the RAM out but one stick and start by testing them. Your RAM is the most likely place for a problem in this situation. #4 If you\'ve striped it down and it still can\'t get a boot (with no post beep). You need to replace the mother board.
Continuse beeping POST code usually RAM or video problems. The problem maybe the RAM, it is faulty or just needsreseating to make proper electrical contact. Reseat the RAM and then boot up your laptop. If it still does not boot up thenremove the RAM module/s and take them to your friendly computer repair shop andget them to test the RAM for you.
Code Beeps POST Routine Description 16h 1-2-2-3 BIOS ROM checksum 20h 1-3-1-1 Test DRAM refresh 22h 1-3-1-3 Test 8742 Keyboard Controller 2Ch 1-3-4-1 RAM failure on address line xxxx* 2Eh 1-3-4-3 RAM failure on data bits xxxx* of low byte of memory bus 46h 2-1-2-3 Check ROM copyright notice 58h 2-2-3-1 Test for unexpected interrupts 98h 1-2 Search for option ROMs. One long, two short beeps on checksum failure. B4h 1 One short beep before boot
this usually means that theres a hardware problem. its possible that you could have short-circuited a device from ESD when you changed your DC jack. always remember, before you take apart your computer, even as symple as swapping RAM, disconnect the power cord, remove the battery, and press and hold the power button for 10 seconds to clear the sensitive circuitry of any remaining juice. if you have the BIOS beeps disabled (as they are default in most newer systems) then you have a real problem. try to listen for the fans to kick on and the hard drive to kick up. if everything sounds ok, then it might be the videocard or the ram. usually, from my past experience, its the processor that has burnt out. but then again, im an overclocker.