Reinstall your driver.
My son stoopped playing a game and started moving his mouse. The mouse started moving slow then shut down. I started the pc back up, fan came on, hard drive started and kept on running, but no video from graphics card or on-board video. I belive the motherboard is bad. It is an e-machine T2260, 2200+ AMD Anthalon with an FIC AM37 motherboard. Help