please help fellows, i have no video output when i boot up. i attempted to clear the cmos and still no luck. i switched out known good pci and agp video cards and still no luck!!! the only slot i have yet to attempt to use is an isa. any suggestions? before the problem, my PC just shut off by itself and would not boot up. The power supply went out and was switched out with a good one. Now that the system boots up, no video!!!!