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LCD Monitor went blank

The Gateway logo and energy star emblem still come on the screen then after few seconds goes blank. When I unhooked from PC and hooked up to the HDMI input from satellite I saw nice picture for about three seconds then went blank and haven't been able to do it again. none of the inputs (HDMI, RCA, VGA, DVI )produce picture now except the Gateway logo and energy star emblem at start up. and the power button lite turns green from orange and menu buttons lite up then all go out as though no signal coming in.

Model = gateway hd2200