now phone is showing itunes screen, its not booting up.. also whn i try to restore it gets restarted aftr some time.. so totally stuck wit it ... any way restore ?

I jailbreak using redsnow it went successful after that I copied ultrasnow manually, after that reboot phone got stuck and am nt able to restore it using iTunes or anything. Pls some one help … pls tell me how to recover from this.. Thanks …..