hello i am running a late 2012 iMac. i just updated to Yosemite os. and i restarted my iMac and now at start up i get a apple loading screen then it goes to grey screen with a no trespassing type of icon. and i can't do anything. i am very worried because i need to get to my desktop to retrieve some items that i have not backed up yet. any help, much appreciated. thanks.
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