Bought IMAC sept2012 after updates gray screen shows up with logo at start up. Please help! I don't know the system as I just start using it and the package did not come with CD to reinstall system. I tried to reboot holding shift but it does not work.

Please help.
I bought the IMAC 21.5" /2.5QC /2X2GB /500GB /6750M sept2012. After the automatic update run when restart computer the screen is on the gray screen with the logo and wont' do anything else. I tried to reboot holding the shift key without success. The package did not come with a CD so I can not reinstall the previous system. I even don't know what is the system that came with the computer because I just start using it. I bought in the US but am in Brazil. HELP PLEASE, how can I get the previous system so I can reinstall it? I do not mind loosing data but I need to work on it. PLEASE HELP! Thanks!

Try booting into the Recovery HD which is on the HD. Restart holding down Command+r and at the screen with four choices select Disk Utility>Macintosh HD and click on 'repair disk'. If any changes are made click on repair disk again until you get a clear pass. Restart as normal from the Apple menu.
More about the Recovery HD:
http://support.apple.com/kb/HT4718

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