Try this. Some monitor with both DVI & Analog input, if no signal into monitor for a while, It default into analog mode. Make sure you push button on monitor to DVI mode (of course after you wake up your computer). If it does not work, try to switch the monitor for a while (if you can borrow or have spare one), Let's see if the problem is from monitor NOT computer itself. It happens to me before. Sonetirot
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