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PC starting, fan spinning for a second before die

By FarCry3r ·
Hi, I have an old PC (maybe 6 or so years old with WinME license sticker on it!) that one day didn't start anymore. I suspect the power supply is the culprit, so I decided to changed another one from my other DEAD PC.

That PC is now working for about 18 hours and died again with the same problem. What could be the REAL problem to this? I've scratches too much hair and want to avoid any more hair losing...

Thanks :)

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All Answers

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How long since it had a cleanup

by Jacky Howe In reply to PC starting, fan spinning ...

A common reason for shutting down is the CPU overheating.

Faulty Fans, Dust and Grime build up on the Heatsink restricting air flow. I would give the inside of the case a blowout with compressed air and then remove the Heatsink, giving it a thorough clean and reseat the CPU applying new CPU grease. If the Fans spin freely when you give them a spin they are probably OK. If there is resistance replace them.

Also check Capacitors around the CPU for swelling or bulging.

A faulty PSU can also cause it. Fluctuating power is no good for the motherboard. Try another one if available or replace it.

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by FarCry3r In reply to How long since it had a c ...

well, I don't think it's about overheating, because it both the CPU & power supply fans are spinning about... 1 second before the system completely shut down. I have to disconnect and replug the power connector to start the system again.

One thing I forgot, before this, after a successful boot up, BIOS says about CMOS error. Could the battery cause the problem? I've tried changing CMOS battery with a newer one but still 1 second spinning only...

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It can overheat in just one second ...

by OldER Mycroft In reply to well...

That is why it shuts down.

If it remained active for longer - the CPU would melt.

Your heatsink should be removed from the CPU, given a thorough wash with soapy water, left to dry thoroughly, then -using thermal paste- re-seated above the CPU and clipped into place.

Also check the CPU fan when it is idle. If it does not spin freely - replace it.

The compressed air treatment, as True Blue mentioned, should not be forgotten.

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i'll try :)

by FarCry3r In reply to It can overheat in just o ...

But as my first post, after replacing the old PSU with other working one, the PC works fine, for about 18 hour or so, but then it started the same problem again.

Could it be something on the mobo is causing my working PSU to fail too? Is it a possible cause?

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And there's more

by Jacky Howe In reply to well...

If cleaning and reseating the CPU doesn't work.

Try removing disconnecting all components except video card, swap it if you have a known good one, add one memory module, CPU and heatsink fan, then try a restart. If it starts, connect the hard drive and try booting into the OS. Progressively add parts until the problem resurfaces.

It is also the Symptom of a short in the system somewhere or an overloaded, defective, PSU.

Excessive current causes the PSU over-current protection to kick in, shutting down the PSU, and it takes an AC mains power cycle to reset the OCP circuit.

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dictionary anyone?

by FarCry3r In reply to And there's more

Looks like I'm going to open a dictionary I'll see what I can do. The system doesn't have GPU, only one PCI modem which I already removed.

I also tried disconnecting all of them, leaving only the mobo and PSU intact, but the problem still same, kick in for 1 second, and pufff... turned off...

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I take it

by Jacky Howe In reply to dictionary anyone?

that what I suggested didn't work. :)

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