I have two Dell Optiplex 745 that will not power up. They were working fine one day, powered off for the night and the next day they did not power on. No disk or fan sounds. Power light is off and the light on the mother board is amber. No beeps, no LED lights on the back. I’ve tried a good power source. The PC?s have not been giving any problems until they just decided to quit. I’ve reseated the cables and memory. How can I tell if it is the power switch, the power supply, the mother board or something else? Thanks in advance.
