So I started installing 10.11 last night once it was finally downloaded. I fell asleep and so did my Mac. When I woke it up today it was stuck on installing, 30 minutes remaining. I let it sit for an hour and no change. So I restarted the Mac and now I get the Apple logo screen and the progress bar and it won't move. I've tried resetting while holding the option key and chose the 10.11 partition with no change for an hour and now tried the OS X installer and it's doing the same thing so far as well. I have everything except my most recent iTunes library backed up. I subscribe to iTunes match so will that have the most recent iTunes library file saved anywhere? I'm not sure what I need to do to get my Mac back to working again. Is there any option without wiping everything? If not, like I said everything is backed up but I'd really rather not go that way if possible. Thank you in advance for your help.