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#11
Well I am just interested in the power the GPU is getting and if you cannot pull up the HW Info stuff then test the supply cable manually with a digital multimeter. Just detach the lead to the GPU while the machine is powered on of course and test the "live" cable against the black ground one. It is usually a 12v supply (live) and anything that is +/- 5% of that voltage is not going to let it work properly ie < than 11.4v or > 12.6v.
The meters are so cheap now too. If you are not familiar with them see my pic.
Having said that I think Arc is probably more qualified on these things than I but do try