Pull the battery, put it back in, turn it on and see what it does from there. If it just goes back to that same screen then try and see if you can select an option with the volume rocker. If that fails you may want to do a search for "stuck in hboot" in these forums or at xda-developers to see if there is a way to fix this. sorry dont have more info right off hand as a fix for this. will see what i can come up with to help ya out.