I have a compaq Presario desktop (AMD K6 processor). When I switched on the computer, fans are running and I can see lights blinking at CD/Keyboards terminals.Monitor light just blinks as if no connection to computer. It is not even doing Power on Self Test. Two days back when it happened, I kept it on for 3 hours. Then after that when I tried it started doing POST and booting. CMOS battery is fine. This time I kept it on one full night. No result so far.