IPhone calendar will not sync with iCal on Mac

Calendar entries on my iPhone 4S/iOS 5.1 will not sync with iCal on my MacBook Pro 2.4/10.6.8, but it will the other way around. I have tried:
Restarting iPhone
Re-setting sync services (holding down Option key and clicking on Sync icon in menu bar)
Changing which calendar to sync with (iTunes 10.6.1)
This may have something to do with having to do a complete Time Machine backup after a Volume Optimisation with Tech Tool Pro rendered my startup disk as un-bootable....???
I do not use Mobile Me or iCloud (can't with Snow Leopard...) and it is a straight USB connection.
I consider myself a medium expert, with no programming/Terminal skills whatsoever.
Any help is appreciated.
Manolis

Thanks. There is another thread that shares a solution that involves deleting ical Library cache files and Preference files. I"ll see if that works. ICloud shouldn't be a factor in my case since I don't use it and it's "off" in Preferences. I am encouraged that I don't need to use it to fix this issue based on other's experiences, but we'll see!

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Hi lbkbrit,
Welcome to the Support Communities! The article below will help you troubleshoot the issue you are having with iCloud calendar on your iPhone and iPad:
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http://support.apple.com/kb/TS3999
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IPhone calendar will not sync with iCal on Mac

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