I have a Dell Precision 330. I have been having problems with it recently. One of the ladies in the office who works on IT stuff off and on ordered a new power supply for it. I installed this power supply. now when I turn the computer on, everything is booting inside the comp, but the light on the monitor stays yellow and the screen stays black. I installed a new video card and same thing. I tried a new monitor, same thing...i tried a new vga cable, same thing. I don't know what else it could be. Any help is greatly appreciated.