Appointments and events keep disappearing from iCal

I put appointments and events on iCal and they keep disappearing.  The ones that were added up until a few weeks ago are still there, just not the newly added ones.  They will be there for maybe a few hours or a day and then vanish.  I'm not techie at all.  Please bear with me.  I have an old MacBook, that runs Mac OS X, 10.6.8 and desperately need help!

Try a reset: Hold down the home button along with the sleep/wake button until you see the apple, then let go.

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    OK Mark/Space Tasks with 2 message(s)
    OK Adobe Reader
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    OK Note Pad
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    If you want to use your back up you need to restore then entire Library from Time Machine, and then replace the damaged Library with it.
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    iCal won't take data. All events disappeared from iCal. Help!

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  • Why do new event items disappear from calendar after a few seconds

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    UPDATED VERSION:
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