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CPU won't post

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  • CPUs
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Last response: in Systems
July 26, 2012 12:44:19 PM

I have agreed to look at a friend's computer to diagnose why it won't power on. The CPU isn't posting (no beep.) I have removed all components besides PSU, HSF, and CPU. Now I get a beep (one sec) and then a long beep (3 sec.) Repeating. So I installed a stick of RAM and now get no beeps. I've tried booting with each of the sticks in each slots and nothing changes.

Apparently the computer was working fine. They restarted it and then this happened.

Before trying this everything seemed to be getting power. And I have read through the "No POST", "system won't boot", and "no video output" checklist.

Any thoughts? Thanks!

More about : cpu post

July 26, 2012 12:53:17 PM

Run memtest on the RAM. If that comes back fine, it has to be the CPU or Motherboard.
July 26, 2012 6:38:04 PM

Sorry for the stupid question, but the only way to do that would be to put the stick(s) in one of my machines and run the test correct?
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July 28, 2012 1:17:09 AM

Yes, you need to try the memory on a working system (or try some known good memory on the bad system). IF the memory comes up good then blow out the dust from the dimm slots in the MB and hope.

Have you goggled the beep code for the PC's BIOS to see what the original beep was? Assume missing memory but.... "beep (one sec) and then a long beep (3 sec.) Repeating."

Checking each dimm in each slot was a good idea.