Last night I tried to restore from backup (my son deleted some files on accident), so I pop the disk in go to utilities and then restore from time machine. Once it's done putting everything back on it tell me to restart the computer. When the iMac comes on it's stuck on the apple logo. Ive tried to hold down option and select the drive that didn't help. How do I get the disk to boot up so I can try to reinstall it again?