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Every day is the same. I arrive to the room, I turn on the PC, screen no signal. If I shut down the PC and boot again, the signal recovers, until the next boot hours later. I've had this problem for months, today it happened two times in a row for the first time. When the "no signal" is showing, I disconnect and reconnect the screen, but the problem persist. I have to shut down and re-boot to have signal. I use Windows 7 Ultimate.

I've found other topics related with the no signal problem, but to me it only happens on first boot, which is very baffling.

Why might this be occuring? How to fix it?

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I would check your video card, if its prebuilt, I would consult the manufacturer, it seems to be some error in your gpu. I would also check the connection on your monitor,if your using a analog video signal, like vga, i would check your cable. And if all fails, try a quick virus scan.

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