I also tried the 2-9-DEPT startup key combo, and it cleared the SD card, but still hangs on the startup screen. The only thing it accomplished was to change the startup message to the factory default message.
Have you tried pushing the firmware file again (manually put it on a card)? Or even an older FW file if you have it. IIRC it will read the card for firmware before the boot screen, so you should be able to get it to shove the firmware in again if you have it on the card.