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What is defect? my cpu, motherboard or psu??

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November 18, 2009 10:46:21 PM

hi,

Just bought some cheap pieces for 150$ but i end up with no POST :( 

after some troubleshooting here's where im at:

With only 24pin plugged in the motherbaord, the fan works. With both 24 and 4pins plugged, just nothing happens.
Since its a cheap board i have no leds or speaker neither does my cheap case :/ 

PSU: Rosewill ISO-450 tested with the "hotwiring" trick ( http://www.techwarelabs.com/guides/misc_mod/psumod/ )
Motherboard: Foxconn G41M-S (brand new)
CPU: old P4 630 3ghz (Was working number 1 but its been on a shelter for months now)

The problem seems to come with the 4pin in the board. I am wondering what piece of hardware causes this.
Is it possible that a defect 4pin plug from my psu stop my motherboard from atleast turning on?
Is the motherboard doa?
Is the cpu finaly dead?

how can i troubleshoot more without to pay for replacement parts or ripping my other pc apart ?

thanks,

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a c 172 à CPUs
a c 156 V Motherboard
November 18, 2009 11:53:17 PM


Our standard checklist and troubleshooting thread:
http://www.tomshardware.com/forum/261145-31-read-postin...

You need a case speaker for troubleshooting.

Once you have a case speaker, the PSU, motherboard, and the CPU; if you boot and you get silence, one of the three is bad. Your only choice is to test by substitution.
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a b à CPUs
a b V Motherboard
November 19, 2009 12:02:20 AM

What he said.

And he means internal PC speaker (not proper speakers).
Will be cheap, or just pull it from something else. I must have like 10 of them at home.
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November 19, 2009 12:23:48 AM

Tried with another pc's speaker but it doesnt beep at all with or without the 4 pin.
Without the 4 pin cpu connector plugged in the motherboard, atleast the fan starts. When i plug the 4pin just nothin happens.

What next? If i have to go by substitution, what do you recommend to try first?
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November 19, 2009 12:52:46 AM

perhaps the psu is at fault? I have yet to have a motherboard completely die on me but then again I usually buy decent mobos and not cheap ones.
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a b à CPUs
a b V Motherboard
November 23, 2009 4:42:27 PM

Well it'll either be PSU, Motherboard, or failing that the CPU itself.
If you have any spares to swap in/out do that. If you don't have spares, and don't want to take it to a shop (where they will have spares to test with), then only option is to buy one part at a time until the problem is solved.

I normally do the latter, and use it as a chance to upgrade.

It would be great if someone came in with a definate answer, but chances are the options above will be the result.

I'd start with motherboard and/or PSU, and CPU as last resort OR take it to a competent shop.
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