It is an emac running OS X 10.4.?. I do not have an iSight camera or any camera hooked up to it. It is connected via a dsl modem. I have a wireless router, but this computer is hooked up directly. Firewall is not enabled. I do not have two macs to test using Bonjour.
The computer locking up first happened with AIM, I uninstalled and reinstalled AIM and got the same results. I then starting using the iChat and got the same results.
Thanks for any help you can give.