We have a Mitsubishi Big screen projection tv model no. VS-50705. when the on button is pushed it clicks like it wants to turn on but then doesnt. When I unplug and plug back in the green light flashes three times but still won't turn on.

This could be a trouble code for your model television. Try counting the blinks and note any pauses in blinking. It could be a one or two digit trouble code. Then once you have that number, type in your tv model along with the words "trouble codes" or "diagnostics codes" or "green light blinking" and see what you get. Hope this helps...