I just bought a new 750W powersupply off of newegg and put it in my computer and tried to fire it up. The fans on the back of my computer spun for a fraction of a second then everything turned off. My monitor kept going from green light to orange light for some reason (even when I turned off the power supply switch in the back and unplugged the power cord). I then took out the powersupply and put my old 480W one back in. Everything worked fine except there was no display on the monitor. When I turned my computer on it would go from orange to green for like 5 seconds then back to orange. At first I thought that it might of been my Video Card. It is an AIW x800 xt. I went to the store and bought a 7800 and put it into my computer and tried turning my computer on. The same thing happened. The only thing I can think of that is left is my motherboard. I really hope that it isn't fried because there is so much stuff to get out of the way to take it out+I need to buy another+I would have to reinstall Windows XP. What do you guys think?