i was trying to delete a web link when my ipod crashed and entered safe mode. it repeated this behavior so i tried deleting the link in safe mode and it worked. then when i respringed, it froze and the screen went black. i rebooted, and now its stuck in a 5-minute cycle where the logo shows up, a loading wheel, and then it reboots. i can't get it into any other mode. any help? please?