i think i once saw the same thing your refering to, op. see my thread from like a year ago. no one could help.
http://forum.ppcgeeks.com/htc-touch-...opping-up.html
i thought it was some sort of dialer screen, but now that i think about it, it could have been a pass code screen. it looked about the size of the screen where you would enter 1234 for a hard reset.