Weird internet airport issue.

5 computers running on a network.
3 imac 24"s all on OSX 10.5.6
2 G5 towers 1 on 10.5.6 the other on 10.4
3 iMacs are on wifi
the G5 towers are hard lined.
The one G5 tower running 10.4 keeps losing internet and then it kills the signal for the rest of the network.
then a window will pop up saying..
"IP configuration
192.xxx.x.x in use by
00:xx:xx:xx:xx:xx, DHCP
server 192.xxx.x.y
this only happens once he turns on the computer.. everything dominos down hill from there for the rest of the day.
any help would be greatly appreciated seeing I'm trying to help my boss who's comp is doing it and I keep getting pulled from illustrations to fix issues.

Hi
Change that users network setting to DHCP rather than manual. That way everyone is assigned an IP address from the DHCP Server (probably your router) and no two clients will have the same address. If everyone is on a Static address make sure no two are the same.
Tony

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Step 1
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