When I power up my computer, my CPU fans spin and the LED lights are on, but nothing shows up on my Dell Dimension 4500 monitor. I have an AGP card ,but it sucks, so I didn't put it in the mobo. Instead, I used the integrated video in the mobo. When I actually tried using my AGP card instead of the integrated video, still nothing shows up on my screen. I tried leaving only the components: Power Supply, CPU FAN, Videocard, but it still doesn't show anything on my monitor. Specs: ATX CASE ADDED ECS RS400-A MOBO DELL DIMENSION 4500 MONITOR Help is greatly appreciated.