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System Crash After Rebuild

Last response: in CPUs
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May 18, 2013 4:18:59 PM

A friend's computer stopped working suddenly and would not boot, so they asked me to take a look at it. I spotted the problem very quickly (blown caps by the cpu). The system is several years old, so I recommended a list of parts for a good modernization; new specs are below.
Windows 7 is now fully installed, all drivers installed. I decided to run a stability test (AMD overdrive test), and after 2 minutes the system had crashed completely. No warnings, temps are fine, just a total shutdown.

So far for troubleshooting I have removed all of the new parts and replaced them with known good components and removed the dedicated video card in case it was a power problem. No luck, still the same problem.
The next step I took in troubleshooting was Memtest 86+, which completed an entire pass (no errors) and was working on the second when the same crash happened.

My guess is that the CPU is the problem, but I wanted to check with some experts and get their opinion before I tell them it's fried.


NEW SPECS:
AMD Phenom 9500 (4 core @ 2.2 GHz) - OLD
2 GB DDR2 800 RAM @ 400 MHz - OLD
ASRock A785GM-LE Motherboard - NEW, latest BIOS
AMD Radeon HD 6450 Dedicated Graphics - NEW
SeaSonic 360 Watt PSU (80 Plus Gold) - NEW
2 Hard Drives

More about : system crash rebuild

a b à CPUs
May 20, 2013 5:14:53 AM

Maybe your PSU is failing to deliver proper power needs
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May 20, 2013 11:25:52 AM

yasserBasha said:
Maybe your PSU is failing to deliver proper power needs


Thanks for your reply.
Maybe, although I did test it without the graphics card to test for that. I think I have an old 650 watt lying around somewhere, I'll try it with that.
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a b à CPUs
May 20, 2013 12:06:02 PM

Great ... do that and let me know.

BEST LUCK
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May 21, 2013 8:16:15 PM

After I replaced the 360 watt PSU with a 650 I had from an older build, I fired up the system and ran load tests again. Same result, system crash after just 2 minutes under full load.
Also, I don't know if it means anything, but the AMD overdrive CPU test reports different values on one of the cores. 3 of the 4 report ~1.4, and the other (which core it is is random) reports ~0.7. If that correlates to effective clock frequencies, that's supposed to be 2.2.
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a b À AMD
a b à CPUs
May 21, 2013 8:27:48 PM

Does your BIOS support disabling cores? If so, then try then one at a time. You may have a bad core.
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May 21, 2013 9:24:52 PM

Thanks, I'll try that. I don't know if the bios supports it but it does have overclock features so it might.
Is it possible that the blown out motherboard caused this? It was working fine under load before it blew, not counting other warning signs like general slowdown.
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