IMac won't restart after latest Safari update.

I just downloaded the latest Safari update (5.1.2) on my iMac (27", i7, latest Snow leopard).  The download (via software update) and install went smooth but when asked to restart, it hangs up at the gray screen...after the blue screen/start up chime, but before the apple logo appears. I tried shutting down and rebooting but it keeps hanging at the same place. 
Thank you in advance for any successful solutions!
Kind regards,
Mark

Hi all,
Thank you for the replies...
I did manage to solve the problem right away by following the instructions offered by Apple:  Remove all USB cables, then do a hard reboot.  Then to isolate the cable causing the problem, plug in one at a time and reboot until the problem happens again.  In my case, the issue was caused by a Flip Camera that was plugged into a USB hub. 
I hope this helps those with a similar problem.
Regards,
Mark

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