Is my PSU in need for replacement

My computer (AMD, 4gig w7 64 pro) quits several times a day. While I am doing something or when nothing is going on. Just like that. I can immediately restart and a registry scan then doesnt show any errors. But then it happens again.

Strange enough the screens go black and the system is down, but the Num lock on my keyboard remains on.

Is the PSU the most logical place to look now?
TheoRichelAsked:
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JohnBusiness Consultant (Owner)Commented:
It is one place to look.

The motherboard could have an intermittent fault (bad capacitors, board traces subject to heat).

The CPU could be overheating, although this seems least likely based on your description.

From a different perspective, a root kit virus can do this on a machine that works perfectly well from a hardware perspective.

Get Real Temp (Google), install it and run it. Monitor temperature of CPU and GPU and see if they are getting too hot.
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Richard BalfreCommented:
A check of the PSU for any visible signs of dust would be a good place to start, but from experience of a similar problem a year or so back, I would more likely expect the issue to be a component issue - overheating component(s) intermittently cutting out. Especially as you suggest the failure occurs when the system is idle as well as when being used.

The suggestion to install Real Temp is a good idea as it may help to pinpoint which component is most likely area of concern. I would expect the motherboard to be the issue with a capacitor or IC overheating and cutting out, but it could be memory or an expansion board pulling everything down.
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AceofSpadesCommented:
A visual inspection of all fans and heat sinks for accumulated dust would be a good step.
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TheoRichelAuthor Commented:
Gentlemen thanks.
RealTemp though gives the message that it is not for my AMD Athlon II x4 645
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Gary CaseRetiredCommented:
"... Is the PSU the most logical place to look now? " ==> YES, by far.    It's definitely the most likely cause.

However, as noted above, if the CPU is hitting a thermal threshold and simply stopping, that would do the same thing.    Less likely -- but much easier to check.    Just install either RealTemp (as suggested above) or CoreTemp ... both are good ... and watch your CPU temps to see if they're tending to spike upwards.     If that's not the case, get a new power supply -- don't skimp on the quality ... get one with Active PFC and with ample "reserve" wattage.

http://www.techpowerup.com/realtemp/
http://www.alcpu.com/CoreTemp/
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Gary CaseRetiredCommented:
... Just saw the note r.e. RealTemp won't work with your CPU.   Try CoreTemp then ... not sure if it supports it either, but won't hurt to try it.
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JohnBusiness Consultant (Owner)Commented:
Try http://www.cputhermometer.com/ for AMD processors. I have not tried it because I only use Intel. but it should work.
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Gary CaseRetiredCommented:
According to CoreTemp's list of supported processors [ http://www.alcpu.com/CoreTemp/supportlist.html ]  your CPU is supported ("All Athlon II series").
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TheoRichelAuthor Commented:
Yes I jhave found Coretemp. Wait and see now.
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Natty GregIn Theory (IT)Commented:
change the psu, then change the fan and heat sink on cpu,
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nobusCommented:
what i do in such a case is using the minimum setup, as described here :
http://www.experts-exchange.com/Hardware/Components/Motherboards/A_1945.html                  (Short-overview-of-how-to-troubleshoot-bad-hardware-when-a-pc-does-not-post)

this will eliminate a lot of hardware causes
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TheoRichelAuthor Commented:
OK, Gentlemen thank you very muchfor your contributions. The problem seems to be solved now. After installing CoreTemp I saw the temp rise to 93 degrees and then the system quit. I then vacuumed the system thoroughly and that made all the difference. 'Average' working temperature was first around 30 en then maxed from time to time. Now it is 20 and doesnt max anymore. I have awarded the first two who put me on this path. Thanks again
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JohnBusiness Consultant (Owner)Commented:
@TheoRichel  - Thanks for the update and I was happy to help.
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