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BIOS / POST beeps w/o CPU ?

Posted on 2003-11-14
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Last Modified: 2010-04-26
My question is rather straightforward:

Will most motherboards give diagnostice beep codes or display anything thru the video if there is no CPU installed ?

I am trying to troubleshoot a system that will not POST at all, and have stripped it down to mobo on an antistatic mat, known working PSU, known working AGP card, CPU and memory.   I am trying to determine if the CPU is fried, the mobo is bad, or if it's something else.

 I am out of thermal paste, so I tried removing the CPU and powering on - still no beeps or any video.  Is this normal ?  Shouldn't the speaker be beeping like crazy, or does th CPU have to be in for the BIOS to work?

Thanks experts !
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Question by:erth
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11 Comments
 
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by:
_ earned 300 total points
ID: 9752899
>>>Will most motherboards give diagnostice beep codes or display anything thru the video if there is no CPU installed ?<<<   No. Memory, CPU, and mobo all must work to get beep codes.

>>>I am trying to determine if the CPU is fried, the mobo is bad<<<   Take out the VIDEO CARD and see if it beeps.  If no, Then you need to try the ram, and then cpu in known working mobo to find out which is bad ( mobo, cpu or ram ).
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by:rid
rid earned 300 total points
ID: 9753238
At least some MB's will beep if RAM is not in place. The processor needs to be there, though, as without the CPU nothing will happen at all. Check speaker connector and wires!
/RID
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by:_
ID: 9757570
>>>some MB's will beep if RAM is not in place<<<   Cool.  Always something new to learn around here.    : )
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LVL 31

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by:rid
ID: 9759834
Hehe...
>>>some MB's will beep if RAM is not in place<<<   -- ergo, memory is not needed for beeping.
/RID
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by:erth
ID: 9765903
Will a fried CPU damage a working mobo ?
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Expert Comment

by:_
ID: 9768911
Sometimes yes. Mostly no. It depends on how it fried.
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by:waffleironhead
ID: 10386771
No comment has been added lately, so it's time to clean up this TA.
I will leave a recommendation in the Cleanup topic area that this question is:

split  between coral47 and rid
 
Please leave any comments here within the next four days.

PLEASE DO NOT ACCEPT THIS COMMENT AS AN ANSWER!

waffleironhead
EE Cleanup Volunteer
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Expert Comment

by:_
ID: 10389443
OK by me.   : )
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Expert Comment

by:rid
ID: 10390120
Concur.
/RID
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by:_
ID: 10423972
Thank you much.    : )
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