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I have this rig in my lab that i use for Virtualisation and Gaming.Something strange happened yesterday while i was using it.The Dual monitors i am running suddenly blacked out i had to press the reset button.Monitors went off but the computer was running and am puzzled.I have reset the Motherboard to its defaults and disabled overclocking.But i need to know what could have caused this.I have recently installed an AMD Radeon HD 6950 and a cooler master 500w smps.

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migrated from serverfault.com Mar 15 '11 at 10:27

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2 Answers

This sounds like a hardware problem, but it could really be anything. The first thing I'd look at would be the PSU - I've had experiences in the past where if the voltage on a particular line fluctuates or drops too much, a similar thing happens.

First thing I'd do is put the original components back in to see if is stable. Then change one thing at a time to see if you can isolate what's causing the problem. Then I'd plug a voltmeter into a molex plug to monitor voltages. If they look to be constantly within tolerence (+/- 5%) then I'd move onto looking at the memory.

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Since it's a newly upgraded system, I would suspect overheating to be the problem. Running a fan speed/temperature logging application may point out an overheating issue. If so, it's likely that you installed the heat-sink or fans improperly.

Alternately, your overclocking settings may be a bit too aggressive which could show up under heavy load such as gaming. Dial them back slightly until the machine becomes stable.

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