I've been working on my iPC for the last couple of days, and the controller will lose power.  The desklights go out, lights on buttons go out, and I get no function from any of the buttons or trackball.  I can tap the face of it, and it comes back on and everything appears to be fine.  What can we do to fix this?  Loose cable?  Bad solder?  Do I need to send it in (I hope it is something you can tell me how to fix...)?  Please let me know as this is a rental console as well.
Thanks!