Out of the blue flickering and iCal won't quit

We bought our iMac 20" last January 2008 and it has worked perfectly. I have installed all updates. After the last update (and I really don't know if it is just coincidence...) iCal won't quit unless it is forced. All data is gone. It might also have something to do with the last time I synced my iPod...?
More troubling, the screen has started flickering... almost shutting down at points. However, it is not on a regular basis and seemingly out of the blue...?
Any help or advice would be greatly appreciated.

Wilrez,
Welcome to Apple Discussions.
Regarding the iCal issue, if you used Software Update for installing OS X 10.5.7, you may want to try reinstalling the update using the Mac OS X 10.5.7 Combo Update.
Let us know what happens with both problems after the reinstallation.
;~)

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Out of the blue flickering and iCal won't quit

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