Screen turns black and computer eventually reboots when I try to mine

[drakahn]

The cards mine fine in a different computer?

If they do, do they still run fine if you use the original PSU?

If they do, do they still run fine if you use the original RAM?

If they do, do they still run fine if you use the original CPU?

If they do, do they still run fine if you use the original HDD?

If they do, do they still run fine if you use the original MB?

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[Asiketeisc]

So far I've tried replacing the:
GPU
PSU
HDD
OS
RAM
MB
CPU

Same problem every time.

[deepceleron]

So far I've tried replacing the:
GPU
PSU
HDD
OS
RAM
MB
CPU

Same problem every time.

If you have that many parts (enough to build another computer), then you should build that other computer and mine with it. When it works fine, then you should have bad main system and good parts system. Eventually swapping components one at a time between the systems (until the only thing not swapped is the motherboard in the case), the problem will move to the other machine, or you have a bad motherboard.