My iMac is frozen on a blue screen during an update software for snow leopard. What do I do? Turn off my imac?

My iMac is frozen on a blue screen during an update of software for snow leopard. What do I do?  Should I turn off the computer?

do a hard shutdown of the mac (holding down the power button until it shuts off) then do an SMC reset, the following article tells how to do this:
http://support.apple.com/kb/HT3964
after doing this reset and restarting the mac, try again to install the update.

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