IMAC G5 and Asante switches

I am in the process of adding an I MAC G5 to my company's existing network. The current architecture is roughly 250 computers set up in multiple workgroups all using statically assigned IP addresses.Also we are using Novell as the file storage system and also for all print queues. Every time that I plug the MAC into the network with its assigned IP, it causes two Asante switches "35160 and 3524" to lock up due to what seems to be a broadcast storm. I have all file sharing and Internet sharing off on the MAC.I have the Bluetooth and Airport off as well. What could cause the switches to lock up or "crash" when the MAC is plugged in?

Apple Talk has been disabled. All I am running is TCP/IP. I also enabled the wireless and it did the same thing. Thank's for the above link! I am not sure what the actual port config is concerning the Spanning Tree Protocol. I will find out though. This is what info is being flooded onto the network once the MAC comes online..
10:04:35.362635 150.2.35.1 > 239.255.255.250: igmp v2 report 239.255.255.250 (DF) [ttl 1]
10:04:35.368400 150.2.35.1 > 239.255.255.250: igmp v2 report 239.255.255.250 (DF) [ttl 1]
10:04:35.372993 150.2.35.1 > 239.255.255.250: igmp v2 report 239.255.255.250 (DF) [ttl 1]

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