MacBook Air upgraded to Mavericks. I'm left with a spinning circle.  What next?

I upgraded to Mavericks last night and my computer won't launch. I'm left with a spinning circle with my desktop graphic behind a white box that has back greyed out and the  continue circle with forward arrow that does nothing.  A spinning circle in the middle is all I see.  What to do now?

I'd just hold down the power button unitl it shuts down. Restart and see if it actually gets through the setup routine.
If not, shut down again and when you restart, hold down cmd-opt-p-r right after the startup tone. keep holding down until you get the tone two more times, then let it restart normally. That resets NVRAM.
http://support.apple.com/kb/HT1379
If problems again, restart holding down the shift key which will start up in Safe Mode.
http://support.apple.com/kb/HT1564
If it boots up in Safe Mode, restart and see if it will boot normally.

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