IMac bad monitor. Bought external monitor, how do you shut off main?

I am one of the poor unfortnuate masses that have a bad iMac monitor - the one with all the lines going down it. Bad pixels. Sheesh.
I bought a HP 20 external monitor and hooked it up, it's working fine.
QUESTION: Am I able to shut down the main monitor down without affecting the external monitor? If so, how?
No sense in having both monitors working.
As always, thanks in advance!

There is no way to turn off the iMac's monitor, however there is a way to dim it to black like Dave suggests using Shades. 
Download Shades for Mac - Control the brightness of your screen. MacUpdate.com

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