Using windows now screen black and cannot see or do anything
My computer was working correctly and I was using it in Windows mode. On changing back to the mac system, I accidentally hit top left-hand corner of the screen with the curser. The screen went all white. I turned off the machine and a little while longer I tried tuning it back on. The screen is black and nothing happens. Although the computer computer is turned on and you can hear the fan and motor running
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