hi i am runnig Millenium edition on a pc pc and it wont boot. there is no beep on boot up,which there was previously and literally nothing displayed on the monitor, its as if its off. It is not off however and i have tested it ok with another pc. There is power to the hard drive and the cpu fan spins up. power light button comes on and hard drive light eluminates as it shuld. Also ram is seated fine and has not been changed recently. i think this is probably the motherboard but i dont know. does anyone have any suggestions? thanks in advance.