Do you have the correct drivers for your GC? How about your PSU? Is it enough for your system? Have you tested the montior on another system? Is the computer shutting down or just a black screen? Are your fans running? Are you using a surge suppressor? If so, is it working correctly?
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If your equation requires either a complex combination of variables to get the desired result OR you can't seem to get the result regardless of the variables....it ain't your variables, it's your constant.