Hey, I had to put in a new power supply; followed eMachines tech's recommendation. Now it runs fine...as long as I don't shut the power off. Reboots; shuts down; boots again from the front panel switch - as long as the power isn't turned off. To boot from cold, I must 1) remove the HD power and data cables. 2) Hold in the front panel switch 3) Turn on the back power switch 4) usually wiggle the front power switch. Once the mobo boots, I can plug the hard drive back in and things run fine! And yes, I've tried a different switch!! Any ideas?