Unit doesnt boot at all just a black screen, buttons light up for 10-15 seconds then the button lights go out and I can just hear the fan running. I can enter the service mode go to update windows ce(with a SD card and Files), but when it goes to write, it freezes at 5 percent. I've tried 2.0,3.0, and 4.01 all freeze at 5%. Whats left to try?