give it a minute. you just installed a ROM
and if it is looping or froze, that can be fixed pretty easily.
Also... after it does boot back up with the new ROM.... let it reload all of your Apps before you start trying to tinker with it.... depending on how many apps it's trying to reload, the Droid may be slightly sluggish due to all the downloading and reinstalling of the apps
There's no danger here because you made a backup. So if this thing doesn't install, we will put the backup on and then I am going to show you the ways of SP Recovery.