RAZR MAXX HD - Stuck in boot loop trying to do a factory reset

[Snareman]

I'm trying to do a factory rest so I can sell the phone but seem to be stuck in a boot look that alternates between the Motorola red M and the android guy with the diamond spinning in his stomach. I'd installed one of the 4.1 (I think?) ROMs awhile back. Not rooted. Any ideas how to get out of this?