MobileMe Won't sync after installing Snow Leopard (PHOTOS)

[AdventurousJosh]

Okay, wow, extremely frustrating. I'm going to try and summarize everything as best as possible.
After installing snow leopard I've had constant issues with mobileme, first with data conflicts, after I choose which data I think is correct (I usually guess) it then (sometimes after several minutes) constantly props me for a password. It's constantly saying this:

It says this WHILE LOGGED IN, I've logged out a million times and logged in, the password is correct.

After I log out and try to log back in, it also gives me this error:

If anyone can tell me how to fix this problem I'll buy you an iMac, this is so frustrating. Thanks.

 

[NewMacbookPlz]

Did you try deleting the entry for MobileMe from your Keychain, and re-creating the entry by re-entering your password as if it were the first time?

 

[jbuk]

Or opening Applications/Utilities/Keychain Access and going to 'Keychain Access>Keychain First Aid', and then following the steps there to verify or repair the keychain?