gateway gt5028

I shutdown my gateway gt5028 one night, the next morning turned on the machine and all i had was a green light on the case and no post. I had the power supply checked where i bought it and it was ok. could the mother board go out this quick? I have considered buying a FIC FIC KTBC51G-LFMBoard S939 which is suppose to be a replacement for the current board. Any thoughts on my problem and is this would be a good route to go.
Thanks Henry