BIOS beeps every 15 secs no video keybd mouse

August 21, 2011 at 12:38:50
Specs: Windows XP, Pentium 4 1.6GHZ, 256MB RAM
Computer doesn't boot... it doesn't have video, keyboard or mouse... the (AMI ) BIOS gives a short (1 sec) beep every 15 seconds which according to AMI's beep codes it should indicate a "Power Error" but the Power Supply works ok on another computer. The harddrive also works and tests ok on another computer,.. the processor heat sink assembly was lose and the thermal grease was dry so the processor must have been overheating because the power didn't shut off as it should have... apparently automatic shutdown is disabled in the BIOS.

According to some comments on the net, the single beep identifies a bad ram module (PC has only one), but it's not specified if the single beep is repeated or not, so as the PSU works fine on another computer, the beep code would maybe indicate a power error in the motherboard, or a bad RAM module, depending on a more specific understanding of the beep code (single beep every 15 seconds).

The computer is 478 Socket Intel D845GLAD motherboard, 1.6 Ghz Pentium 4 Processor with efficient (all plastic) cooler assembly, one DDR2100 RAM module of 256MB, 300W Premier Power Source, I've thoroughly cleaned the heat sink, cleaned the processor with alcohol and it shows no sign of overheating and the motherboard and RAM have no signs of overheating, puffed capacitors, or abnormally colored/discolored components... I've reassembled the processor & cooling assembly with new thermal grease and have disconnected all other devices, keyboard, mouse and monitor work ok...

So it's now a toss between Motherboard, Processor or RAM and my question would be: Which component seems to you the more likely cause or more specifically, which of the three would be more likely to get damaged if the system overheated and the BIOS didn't shut it down?... also if you have a better understanding of the beep code & general problem, I would appreciate your comments.

Thank you for your time and excuse second language errors I may have.

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August 21, 2011 at 20:02:00
2 Beep code charts that might help:

I would definitely suspect your memory but see if either of these charts sheds more light on the trouble or simply see if you can borrow another stick of memory of compatible type and see if that helps.

You have to be a little bit crazy to keep you from going insane.

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August 22, 2011 at 12:42:18
Thank you for responding... I have now ordered a RAM module and since there is absolutely no screen activity, I also ordered a cheap video card and I should have the solution in few days.. in case none is causing the problem, the PC needs both upgrades anyway... and if the processor turns out to be the cause, I have seen a few replacements in the area offered as low as $15. So I should be able to post back the outcome soon. Thanks for your help.

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