I have a Lenovo desktop system with a MTM77521YU motherboard and a 280W power supply. Last week, it would not respond to the power switch. i.e. There was no indication it was powering up - no lights, no fans, no POST. I checked, and there was 120V at the power cord. A couple of days later, I tried it again. It booted on the first press of the button and I was able to use it for a couple of hours with no problems. I shut it down as usual, but it would not power on again this week. The button feels fine and I hear a "click" when I press it, but I can't get a volt-ohm meter to it to check whether the switch is opening and closing properly.
Any suggestions on what the problem is and how do I pinpoint it?
