2.2 froyo - HTC Desire won't boot past the bootloader screen

I have an HTC Desire and it is freezing when it attempts to boot (when the HTC logo appears). I played around with clear cache, factory settings, etc, and now the boot sequence gets stuck at:

--- AlphaRev ---

BRAVO PVT4 SHIP S-OFF
HBOOT-6.93.1002
MICROP-051d
TOUCH PANEL-SYNW0101
RADIO-5.17.05.23

Aug 10 2010, 17:52:18

And only four options:

BOOTLOADER
REBOOT
REBOOT BOOTLOADER
POWER DOWN

Nothing is happening when I select an option from those four. What can I do?