I recently tried updating my iMac, now when I power up it keeps telling me to restart the computer. How can I fix this on my own?

I tride installing updates for my iMac, and now when I try to turn it on it just comes up with a small window that tells me to turn off, then back on the computer. Is there a way I can fix this on my own?

Do you have any backups of your system prior to do those updates?  If so revert them out.  Or reinstall the system from your recovery partition.
The reason for this is those updates clobbered a log of people:
Thunderbolt Software Update 1.2 Causes Boot Failures
Thunderbolt Update plaguing MacBook Pros with kernel panics
So the only solution is to get them out of there and the only way to do that is revert your system.
OS X Lion: About Lion Recovery

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