Oh man, that's a tough situation. If I were you, I'd just flash Clockwork Recovery again and see if you can try wiping the device and re-installing the Nandroid backup of your ICS.
Download which ever one fits your device, but if it is international, then I'd say it's the GSM one.
Another option would be to mount the device as USB mass storage AFTER installing Clockwork Mod, backing up all the data you need, and then installing an RUU which will wipe everything on the device but will install the latest ROM for you with no problems.
You can get the correct RUU from here:
Directory listing of http://www.htcruu.com/Endeavor
FileFactory Folder View - Endeavor
And this is how you find out which one you need:
And by the way, have you by any chance updated your HBOOT or is it the same version?