Will PC POST if CPU is bad?

April 30, 2011 at 08:49:55
Specs: Windows Server 2008, amd dual core / 4 gb
I replaced a mobo in a laptop. The mobo gets power as per lights and fan spinning; but that's it, no POST or beeps or nothing. If the cpu were bad, wouldn't it still POST?

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April 30, 2011 at 09:34:17
No it wouldn't post if the CPU were bad. The motherboard needs the CPU to do the Power On Self Test to begin with. By the time you hear the POST bleep the CPU has executed a few million instructions.

However there are many other things that will prevent a computer from posting and a bad CPU is the least likely culprit unless you have done something to damage it like run it without a heat-sink or given it too many volts..

Power supply, memory, and video can all prevent a computer from posting if they are faulty. The fact that the lights are on and the fans are spinning doesn't necessarily mean the power supply is good.


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April 30, 2011 at 09:54:21
Thanks so much for your reply Stuart. I wasn't sure about a faulty cpu preventing post. It seems to me, however, that other components that may be faulty, like memory and video, will result in a post beep error; which, I thought, was one of the reasons for the post.

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