Why would my MBA become black and will not wake up pressing any key ?

I have my MBA since 2008, wonderful, no problem. But suddenly, when I come to my desk in the morning, the screen is black and no key will make it come alive again.
I have to switch it off, and on again to regain activity.
Why would that be ?

I have started experiencing the same problem and I'm testing the machine before bringing it in for repair. It seems to be affected at high CPU usage. To bring the screen back on I usually close the lidm put it to sleep and then open the lid again.

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