Posted 20 August 2012 - 08:14 PM
One time this happened and because it was set for dual display, I had to press the F4 (on my laptop anyway,
a compaq presario) and it came on. Having mentioned this to a friend, he said, something similar happened
and he had kids on his laptop and they must have pressed the "dimming" key for the monitor. Check your
keyboard for something that looks like a monitor and plus key and try that, worth a shot anyway.