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OEM Q8200 Rig - Random shutdowns

post #1 of 8
Thread Starter 
Hi,

A friend has a Hewlett Packard rig with a Q8200. It's an OEM rig, so it's never been overclocked. For some reason, it randomly switches itself off with no explanation. I've been trying to diagnose it, and I think it's the PSU that's bad, but I'm not certain.
I don't have the exact specs but from what I gather:

Intel Q8200
4GB DDR2
Nvidia graphics card

That's all I have at the moment.

The shutdowns are random and unpredictable. Sometimes they occur under medium load, other times whilst nearly idle (example: chatting on msn, nothing else).
They're instant power-off - instant shutdown as if someone unplugged it. No warning, no hangs, no BSODs.

It's plugged into a good surge protector. I don't know the exact rating, but the least it can be rated at is 1940 Joules (because he has a similar, cheaper one that is U1940J. The one the computer is connected to is a better one).
Temperatures stayed below 70c running IntelBurnTest

Running IntelBurnTest on it produces odd results.
First run: maximum memory (approx 3GB), extreme stress mode enabled - it switched off within 10 seconds, exactly like it did before.
Second: 2048MB, extreme stress mode disabled - 5 passes complete
Third: 3GB, extreme stress mode disabled - 5 passes complete
Fourth: 3GB, extreme stress mode enabled - 20 passes complete.

Stuck for ideas. Any suggestions?


Update:
It completed the 20 passes of IBT, then five minutes later he went to use msn and facebook and it shutdown again.
Edited by [Adz] - 3/5/11 at 1:31pm
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post #2 of 8
Did you clean out all of the dust within the rig?
I would almost say overheat :/
    
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post #3 of 8
I think the Bios dosent like those high temps. Put on some new TIM and then see
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post #4 of 8
Temperatures?* Memtest okay?

My suspicion is either temps or power supply. Could be a problem on the motherboard though, but that's unlikely. Most other faults ought to leave the PC running in one way or another...

Edit: What I meant was "What are the maximum temperatures in the Bios?". It's late. What can I say?


Double Edit: Viruses?
Edited by Korlus - 3/5/11 at 12:27pm
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post #5 of 8
Thread Starter 
Quote:
Originally Posted by MR KROGOTH View Post
Did you clean out all of the dust within the rig?
I would almost say overheat :/
Quote:
Originally Posted by JuStIn871 View Post
I think the Bios dosent like those high temps. Put on some new TIM and then see
I thought that <70c was fine for those chips?
But even still, it survives those temperatures through linpack, and then crashed 5 minutes later when he's just browsing the web (load: 5-20%). *Updated OP*

Quote:
Originally Posted by Korlus View Post
Temperatures?* Memtest okay?

My suspicion is either temps or power supply. Could be a problem on the motherboard though, but that's unlikely. Most other faults ought to leave the PC running in one way or another...

Edit: What I meant was "What are the maximum temperatures in the Bios?". It's late. What can I say?


Double Edit: Viruses?
Temps stay <70c at full load on the hottest core which was around 10c above the rest. At idle, the hottest was 50~ while the other three cores are ~40c. The highest was 68, the rest were 58-63.

But I just got him to go through BIOS and there are no options to check the max temperatures in the BIOS. The closest thing to that is SmartFan enable/disable switch (but no option to check the cutoff temperature).
AC Power Loss State was set to "last state". So in theory, it should switch itself back on, but when it shuts down, it doesn't turn itself back on.
I changed it to Power On, so that if turns on next time, it's definitely losing power rather than turning itself off.

But I've just realised, I've made the same mistake again. It's a Q8200, not a Q6600. *Title change*


Edit: not a virus - it's persisted over multiple OS installs.
Edited by [Adz] - 3/5/11 at 1:33pm
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post #6 of 8
Thread Starter 
Update:
It shutdown again, and didn't switch itself back on, even with the AC power loss state to power on.
But there was no load - he was reading a story on a webpage, that's all. Temperature doesn't fit...
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post #7 of 8
So, it's not a virus and it's not the processor's temperature. Can you please run memtest to check if it's the RAM? It's unlikely, but possible. Otherwise I'm going to go with power supply or other major component failure.

(i.e. poor soldering on the motherboard etc).

Maybe try shaking the computer while it's on? Not too hard, but enough that would dislodge a wire or equivellent? Could be a cable not making proper connection? Or something...
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post #8 of 8
Thread Starter 
Quote:
Originally Posted by Korlus View Post
So, it's not a virus and it's not the processor's temperature. Can you please run memtest to check if it's the RAM? It's unlikely, but possible. Otherwise I'm going to go with power supply or other major component failure.

(i.e. poor soldering on the motherboard etc).

Maybe try shaking the computer while it's on? Not too hard, but enough that would dislodge a wire or equivellent? Could be a cable not making proper connection? Or something...
I'll get him to run memtest, but I would have expected memory errors to cause BSODs left right and centre rather than instant shutoffs.

Coincidentally, my laptop did the same instant shutoff last night, but that was because it overheated. Need to clean the dust out of it.
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