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First shut your computer off. Wait a few seconds (to allow the hard drive to stop spinning) and start the computer again.
Start repeatedly pressing F2 while the Acer logo is displaying. Press it once, wait a second, press, it again, wait another second, and repeat this while the Acer logo is displaying until you see the bios setup screen.
Either the wrong screen driver has been loaded or the screen is faulty. Load Control Panel, select "Device Manager" and look for "Display Adapters". Open it and select "Drivers" then "Update Drivers". If that doesn't fix it, you probably have a display hardware failure.