I have a strange second display problem.

I have a late 2007 20"iMac with a Dell UltraSharp 18" second display.  I am running Snow Leopard with all updates. 
This setup has been working great for some 3 1/2 years up to about two weeks ago.  Suddenly it is like the left 20% of my second display is unresponsive to the mouse, display is displaying everything OK and the muse pointer can move there, but the click is not doing anything.  For example, if I put a Safari window on this screen and click of any of the links in this area nothing happens, however if I move the whole Safari window so the left side is 20% or more from the left edge of the display the same links are just fine.
Anybody ever seen this and know how to fix it?
Thanks, Bjarne

OK, no trouble shooting. The first thing I'd attempt is restarting in Safe Mode. If you still don't have luck try doing both a SMC and PRAM reset, it wouldn't hurt to do the SMC reset a couple of times. If still no luck let us know.
SMC RESET
Shut down the computer.
Unplug the computer's power cord and all peripherals.
Press and hold the power button for 5 seconds.
Release the power button.
Attach the computers power cable.
Press the power button to turn on the computer.
PRAM RESET
Shut down the computer.
Locate the following keys on the keyboard: Command, Option, P, and R. You will need to hold these keys down simultaneously in step 4.
Turn on the computer.
Press and hold the Command-Option-P-R keys. You must press this key combination before the gray screen appears.
Hold the keys down until the computer restarts and you hear the startup sound for the second time.
Release the keys.

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