PC shut-down during Prime95 test, won't power back on.

[kiwi213]

Hello,

I've recently overclocked my Phenom x6 1055t from a stable 3.5ghz to 3.7ghz on an MSI 870-c45 motherboard.

I've used these settings:

Bus speed to 265,
HT Link and NB Multiplier x8 (2120MHz)
Ram at 1412MHz 1.55V (+0.05V)
Core at 1.375V (+0.075V)
CPU NB VID 1.2V (Normal)
NB Voltage 1.1V (Normal)
HT Link Voltage 1.2V (Normal)
NB/PCIe/PLL Voltage 1.8V (Normal)
CPU PLL 2.5V (Normal).

PSU XFX ProSeries 550W Core Edition
RAM is OCZ Gold 2x4gb ddr3 1333
GPU is a GTX 570
Running an SSD+HDD and 6 case fans, on a Corsair Carbide 200R

After 10 minutes of prime95 large fft's test, the pc suddenly shuts down with the power led blinking. I've tried clearing the CMOS, powering without ram, with the CPU 4-pin cable disconnected, with the GPU disconnected. It doesn't power on.

If I unplug the psu cable, leave it for about 20 seconds and try power back on, the case fans light-up for about half a second and move about a quarter-rotation.

I know that MSI motherboards are crap for OC, and fry quickly.

I'm just trying to determine here if I fried my PSU, CPU, mobo or a combination? Any help is appreciated.

Thanks.

 

[Beezy]

PSU may have failed under stress even though that XFX is a good unit its not impossible . also with a bus speed that high you need to set your PCI bus to 100 of coudlve caused instability in the PCI lanes ? Do you have another computer to test on?

 

[i7Baby]

What cpu temps were you getting? I'm suspecting you fried your cpu.

What cpu cooler you using?

 

[kiwi213]

The mobo was at around 55 and the CPU around 60 before the crash. The cooler is a Zalman CNPS5X Performa. Never went above 45 on 3.5ghz.

I don't have any other system to test on, that's what I'm trying to determine what has failed so I now what to replace.

 

[i7Baby]

If you remove the drives, does it post?

If not, go through Tom's checklist - http://www.tomshardware.com/forum/261145-31-perform-steps-posting-post-boot-video-problems

 

[kiwi213]

I tried disconnecting everything except the mobo and it powered-on. As soon as I connect the cpu or gpu or anything else it won't power on.

 

[i7Baby]

Then you need to replace parts. Time to upgrade - try Z97/LGA1150 eg i5 4690k and ASRock Z97 Extreme 4 mobo

 

[kiwi213]

Tested it today with a new PSU and CPU. The motherboard is fried.

Going for a more budget solution. I was thinking at an FX6350. with this motherboard.

http://www.amazon.co.uk/Gigabyte-970A-UD3P-Motherboard-Gigabit-Ethernet/dp/B00F5R9O46/ref=sr_1_4?ie=UTF8&qid=1408735035&sr=8-4&keywords=am3%2B+motherboard