I have a Dell Inspiron 570 desktop that I am trying to fix for a friend. The front panel power light comes on, the CPU fan works, no video output, and then the power light simply blinks about every 2 seconds. The whole system is dead. No BIOS comes up. Nada. I even replaced the power supply and mother board and the same thing happens. About all that's left to replace is the CPU (Athlon II).