A powerswitch seems like it'd be repairable.

The automatic standby on the GSP 370 is so good tho, that I've almost never touched the powerbutton after I first turned them on, years ago.

They wake up and go to sleep based on whether they receive audio. I have a keyboard shortcut set to switch between them and the speakers. I hit shift+f10 and put them on. No menus, no power switch, nothing.