If you are not getting beep codes, the video is not likely the problem. That model has a power supply issue that may be your real problem. The way to tell is the power button will blink or be solid amber in color. If this is the case, pull the CMOS battery and let it sit for a few minutes, then replace and try again. If it starts, the power supply is causing the problem and needs to be replaced soon, as it is most likely putting out too much voltage on the +5 side. If it still will not start, it has fail outright. If you determine the power supply is good, the processor and/or the systemboard is bad. I really think the problem is the power supply.