My 4500 only powers on with great difficulty. The button on front bezel usually does nothing when pressed - the switch assembly itself has been replaced at least 4 times with a new one which works fine for a short while. Finally the 2 "hot" wires on the switch were located and when shorted usually allow power on. However this is not 100% of the time. Sometimes the power cord must be disconnected and possibly also re-seat the plug from the motherboard. Various combinations of USB connections have also been tried - minimum # seems to work the best.

Are there any suggestions for permanently fixing the bug ? Thanx.

Bewildered Bob