Hello,  After upgrading my OS to Mavericks my iMac crashes when I log in.  Any suggestions?

Need some advice,  after downloading Mavericks, my iMac crashes upon logging in... When I log back in it says that I turned off my computer due to a problem.  I cant get any other info on my Mac as I can't log back in, but Its a 2011, 21 inch, iMac.  Any suggestions???

Try to narrow it down even further. Disconnect everything, including the keyboard, and add things back one at a time, keyboard last.
The built-in hubs of keyboards have been known to be wonky. It is possible that for some reason it (or another peripheral device) is drawing too much power.

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