f90bt startup- buttons light up, no screen, shuts off???

[20psirabbit]

so after over a year, my f90bt is all of a sudden being super bad.

it's run this whole time, no problems. it's upgraded to 3.0 or 3.1 (can't remember which) i drove the car last week and it was acting fine. when i started the car to put it in the garage, the unit never booted, and hasn't since. now the menu & map buttons light up, the unit sounds like it's starting up. the screen never displays anything, and after 20 seconds it shuts off. it doesn't reboot, just stays off.

tonight i made a testmode sd card, and i can get it into testmode. so now i'm even more confused. i'm assuming something in the os is maybe corrupt and won't boot the system? i'm not sure where to start, but if i could diagnose and fix it that would be great as i don't really want to wait 6-8 weeks for pioneer to fix it if i can help it.

has anyone else had this problem?