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Non-boot ideas?

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by cfrank01

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I am working on a friend's computer that quit booting. His power supply fan was fried and his CPU heatsink had come part way off. I have replaced the power supply and CPU heatsink/fan. When I turn on system, all the fans turn but I get nothing on the screen. Also the system emits a series of long beeps. My suspicions are either the MB or CPU. The CPU shows no signs of overheating (i.e. scorch marks, etc.) Any suggestions would be appreciated.

9 replies

by willcomp

If the heatsink separated from the CPU (not making good contact), the CPU is likely toast even with no visible signs of damage. If CPU got hot enough, mobo may be a goner also.

Sounds like initial problem was overheating power supply (failed fan) and things just got progressively worse.

I would test drives and memory in another system before attempting any more repairs. If they're dead also, may as well build or buy a new system.

Dalton

by dmiles

If the BIOS is a Award or Phoenix then the LOng series of beeps will denote that you have a memory problem,try reseating the memory and hopefully this will help

by rindi1

What is make and model is your mobo? What make and model the CPU? Some CPU's turn themselves off when overheating, some mobo's do that as well. If the mobo doesn't have that feature, and the CPU doesn't either, Your CPU is definitely fried.

by daowen

Could be a couple of things.

First: How many beeps? Is it continual short ones, 3 short and 1 long?

Try the following pending on the answer:

Pop the boards and replace the ram with a single band (64or 128 to keep it cheap). See when it stops firing up. Start with just basic system, mobo, CPU, ram and video. If it fires up then you are looking at the other cards that are shorted our. If it keeps beeping replace the video with a cheap 2 megger and see if it fires up. If not then you have isolated the problem to the mobo or CPU. Toast the mobo and CPU for they are easy to replace. Test the drives after replacing for they can get toasted.

Most mobo's turn everything off when the powersupply hits a high temp. If the CPU goes to high it will also shut off the system. If it did not then it is an old system and might as well upgrade.

Doug

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