Is it possible to try the monitor on another computer? If so try that. I've worked with motherboards that don't give a power up beep code (strange, I know), so after the checking the monitor, I would try removing and re-seating the video card, and memory, one at a time and see what happens. Is the cpu fan running? Check these things out. Is there onboard, integrated video in addition to the graphics card? If so, try using the integrated video port. If the cpu fan is running, and the power led and hard drive leds are working, then it's a safe bet it's not your power supply. It would have to be the video card, in my opinion .