IMac won't video iChat...but my 12" powerbook will...

I bought a new iMac 1.83 GHz Intel Core Duo with the built in iSight..however every time I try to connect with a buddy to do a video iChat, it never connects. I get an error message that says something like, "there was a problem with participants..." Then I'm forced to use my 12" powerbook...connects like a champ..same wireless internet connection. Any ideas?
Thanks
17" iMac 1.83 Intel Core Duo Mac OS X (10.4.7)

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In the past week or so, I've started to have problems with my iMac freezing. This has occurred while using iChat, playing World of Warcraft and while using Safari (not all at once).
In short, the video display seems to freeze. I can still hear audio (ie. the other person on iChat speaking), but everything else in non-responsive. The keyboard does not respond and I cannot ALT-Tab or open any other programs. My only recourse is to manually turn off the computer and try again.
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IMac won't video iChat...but my 12" powerbook will...

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