I have a computer DELL XPS 8900, 5 years old. Power switch often (50%) does not start the computer. The following procedure can start it: after pressing the button about 5 sec the switch light flashes. I pull out the power cord and when the light stop flashing I reconnect the power cord, the computer turns off. Follows normal start.

Is there a switch fault, is repair possible and efficient,  where can I get a new power button module online in Europe? Thanks for the help! Anton, Ljubljana.