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Motherboard or Processor failure?

By tcarls ·
I am trying to fix a computer for someone and was told the computer wouldn't boot up. I checked it out and this PC does not do anything other than the power supply turns on and I hear a few hard drive clicks then nothing. There are no beeps and nothing whatsoever on the monitor. It appears there BIOS is an Award BIOS because Award is stamped on one of the chips on the motherboard. I removed and reseated all cables and adapter cards as well as the memory. While testing all this I noticed that the heat sink fan on the processor does not turn on while the PC is on. My thinking is that the motherboard is shot (the heat sink is not getting power to turn on from the motherboard) and because of this I think that the processor is now probably shot as well. There is no real direct question here, I am just looking for thoughts, suggestions or second opinions on this situation.

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Motherboard or Processor failure?

by Albert Franco II In reply to Motherboard or Processor ...

Try a different power supply first. A lot of times the power supply is actually the problem. It must supply several different voltages and it's not hard for one them to be bad. It only takes one bad voltage level to screw up the whole thing.

Since there are no beeps it seems to me that the mother board is acting as if it's not plugged in.

As far as the motherboard and processor both being shot that's not a given. It's very possible that only one of the two has failed. (if either).

A little more testing is in order...

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Motherboard or Processor failure?

by tcarls In reply to Motherboard or Processor ...

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Motherboard or Processor failure?

by JF777 In reply to Motherboard or Processor ...

GOOD TIP IS ALSO REMOVING CMOS BATTERY INCASE BATTERY HAS SHORT CICUITED, OR REMOVE BATTERY FOR 5MINS, TO DISCHARGE BOARD FOR SPURIOUS FAULTS

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Motherboard or Processor failure?

by tcarls In reply to Motherboard or Processor ...

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Motherboard or Processor failure?

by DS9 In reply to Motherboard or Processor ...

I agree it is most probably the power supply. Especially if it's an e-Machine. I've replaced at least a dozen in eMachines where the customer says "hard drive wont run", "Monitor won't come on" and yes NO Beeps.?

My bet goes on the power supply 90%. No, if it's an eMachine, 100%.

Cheers

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Motherboard or Processor failure?

by DS9 In reply to Motherboard or Processor ...

Just wanted to add, the CPU fan does not run when that happens also. Yet, the power supply fan does.!!

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Motherboard or Processor failure?

by tcarls In reply to Motherboard or Processor ...

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Motherboard or Processor failure?

by cd In reply to Motherboard or Processor ...

Before jumping to conclusions:
- some MBs have a LED somewhere to is the mainboard is powered
- if there is the power source, you may have processor and MB still healthy
- fan is powered from MB or the source directly? If from source, there may rest the problem.

Change power source, then check other causes.

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Motherboard or Processor failure?

by tcarls In reply to Motherboard or Processor ...

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Motherboard or Processor failure?

by BV2 In reply to Motherboard or Processor ...

Try replacing the fan first if it's a bid dog proc (Ghz or close to) - I just had a Ghz machine that wouldn't power-up because the user had put a smaller fan and heat sink on and it heated so quick it would not post - I put the Intel heat sink and fan on and it posted - turned out the board was funky and I had to replace that as well, but without the FSC I would have had the same problems with a new board. The order I would check - FSC, PS, mobo.

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