Dead PC. CPU or Motherboard?

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everway9

everway9

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Jul 17, 2012
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Hi all. :)

I'm wondering if anyone can tell me how to find out whether a CPU or Motherboard is at fault in my PC?

The Pc is a HP Pavilion Slimline (not by today's standards :) ) s3545uk and I have no display from both the onboard GPU and the extra GPU card. I've taken the CPU heatsink off and when I power up the system the CPU does not warm up at all. So I'm wondering if it would be the CPU or mobo which has died. Or maybe even both. Arrrrrgh!

Any help would be muchly appreciated.

Thanks. :)
 
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boosted1g

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Jun 12, 2013
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CPU is rarely ever at fault.

Main 2 reasons of CPU failure:
1) physically damaged pins
2) Overheated to the point of thermal damage.

Also you should NEVER run the CPU without heatsink. the cooler itself will wam up to touch if it is at normlal temp.
In your case it sounds like your board is bad so it never even turned on the CPU so you did not damage the CPU, but had it turned on, it would take no time at all to completely trash it.

Have you tested the power supply at all, or tried without dedicated GPU plugged in, or tired single stick of memory?

 
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everway9

everway9

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Jul 17, 2012
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Hi boosted1g. :)

Thanks for your reply.

OMG... talk about possibly missing the obvious. No I haven't tested the PSU.

With regards to running the CPU without the heatsink. I'm aware that running the cpu for longer than even a few seconds would trash it. I was there with my knuckle on the cpu and finger on the power switch ready to turn it off immediately I noticed it warming up. I once made the big mistake doing that with an old AMD athlon XP. Got a burnt knuckle within a couple of seconds. That one was working properly. :D Those CPU's heated up superfast. :D

I do actually have a replacement board ordered which I found on ebay for £30. But before it gets dispatched I'll test the PSU with my multimeter. Do you happen to know what voltages the cpu power cable pins should be at? No probs if you don't I'm sure google will know.

I thought to myself that the CPU's are rarely at fault and you have confirmed that.

Thanks again. :)
 
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boosted1g

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Jun 12, 2013
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Just do a simple paperclip test.

Remove 24pin from mobo, bend paperclip into U shape, put one end of cable in the green wire (pin 16), and the other end into one of the ground wires.
arranque-direc-3.JPG
 
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everway9

everway9

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Jul 17, 2012
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Thanks for the diagram. I just checked the PSU and that's fine.

Sorry... earlier I was meaning the additional 4 pin cable some boards/psu's have but that's irrelevant as there isn't one on this computer. :D
 
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jaslion

Splendid
Dec 17, 2012
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I'm 90% sure the psu has failed.
 
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everway9

everway9

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Jul 17, 2012
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10,690
When the PC is intact and powered on the cpu fan works, the psu fan works, the DVD drive opens and closes and the hard drive spins up. So I'm sure the PSU is not at fault and it's either the mobo or the CPU. And as boosted1g said it's unlikely that it's the CPU. We'll find out soon when I get the new mobo fitted. :)
 
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