Did you plug it in? [I gotta ask, dude, sorry]

EDIT: hahaha...cool, yea, you should be good to go. It may have been your backup that caused you some problems - you mentioned using HTC Backup. Try flashing again, make sure you hard reset afterwards, then try soft resetting to see if you get stuck. If not, then move on to your back up...if the phone locks up again, we'll know it's the backup utility causing the issues and nothing ROM or flash related.