My Droid did the same yesterday. I updated thru the ROM Manager to Froyo 2.2 and after it installed and went to reboot, it has been stuck on the DroidMod screen ever since (3pm yesterday). I cannot get to any other screen.
I have tried: removing the battery, removing the sim card, using another battery, holding down the camera button, on/off, volume up and down buttons at the same time. Plugging into my computer, computer won't open/recogonize the device. Nothing is working. The screen is "refreshing" but won't update.
Any other ideas? HELP, please!! FYI - I'll need layman's terms...