Earlier today, the PC turned on fine. Then I shut down, turned the switch button off on the back of the computer case. Later I switched the plug back on, pressed the Power Button, but there was no indication of anything. No power, no light, no fan running. I tried open the case to check, I saw the Power button light is "ON" on the motherboard. So I don't think it's the motherboard problem. I check the wire cable from the Power Button to the motherboard, everything is fine. I even unplug the Power Button cable and re-plug them back into the motherboard. Still not on. Anyone has any idea or clue as to why it can't be turn on? I really don't want to buy another PSU or motherboard until I get enough clue. Thank you.