One of the Trimble 750s failed to boot the other day and it was stuck in a loop of starting, booting, shutting down, and repeating the cycle.  Today it won't even try to boot, it just has a light gray screen.  If you hold the buttons to attempt a reset, then the light bar will come on and the lights will walk back and forth in a lame attempt to imitate "Kit" off of the old Knight Rider show.  Is there any way to boot from a USB stick to attempt a recovery, or is this strictly an Ag Express issue?