Imac ical cannot connect to server

I have an imac, iphone, ipad, and mobile me. 
I mistakenly deleted some info in my key chain. 
Now calender events put in my iphone will not show up in imac calendar. 
They do show up in the mobile me calendar and the ipad calender.
I get a message on my imac stating ical cannot connect to server.
Suggestions?

Clarification:  The error says:  "The server responded with an error.  The server did not recognize your user name or password for account......"

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