Help need my mac pro for school..it has Grey screen..spinning wheel...repaid disk ok...repair disk permission all repaired but one warning...

Help need my mac pro for school..it has Grey screen..spinning wheel...
I think I have  mountain lion OS X....I have done I think almost every suggestion I've seen in discussion boards.
Boot in recovery repaired disk...ok...repair disk permission...all repaired but one warning...I've tried to reinstall lion (without losing data) and it Got all the way to one minute to be done and then the time change back two hours and kept doing this all night long.  I haven't done a back up due to no external for time machine.
I hope someone can please help me I've been going crazy for a week now trying to figure this out.  I use my computer for school and I'm currently very behind from in my school work  thank you
Also I've checked my available space  424.91 free of 750 gigs....disk is verified

Welcome to the Apple Support Communities
Try holding the Shift key while your Mac is starting to start into safe mode. Then, after starting in safe mode, open Finder, select Go menu (on the menu bar) > Go to Folder, and type /Library/StartupItems. Then, empty this folder and restart the Mac.
If your Mac starts after doing this, it was a problem with a third-party app that starts automatically when you turn on the computer. It won't start automatically anymore after doing that

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