Ical will not recognise my yahoo password

My I Cal keeps reminding me to log into my yahoo account to sync my contacts,   but when I put in my yahoo password it tells me its wrong (although its not)
and keeps on bouncing up and down to remind me.  How do I stop it and/or sync Ical to my yahoo. 

Hello,
Which version of the PowerBook do you own?
If it's the titanium model then it has an Airport card, which would not be compatible with wireless security setting of WAP2, so check your security setting on your wireless router.
If your security settings are WPA or WEP, then try resetting your PowerBook PMU and try again.
To rest the PMU follow this link.
http://support.apple.com/kb/HT1431
Good Luck.

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