Why Can't I connect my  iMac to the DSL via the 5-posrt switch?

I have been using SBC DSL for about 4 years. 2Wire DSL modem and connect this iMac to the network through a switch (splitter) because I have other ethernet lines to a base station and to another computer. Recently I upgraded the OS from 9.2.2 by adding 10.3 and now the only way I can connect is with the iMac directly to the 2Wire modem. I've switched the ethernet cables, I've tried reinstalling everything again, but no luck. The network preference "sometimes" says I'm connected via an ethernet line but the dhcp is 10.0.xxx. So when I try to Renew...I never get a good DHCP connection.
If I was never able to connect via this switch box...I wouldn't complain, but this has made me rather nuts....when I connect this iMac directly to the 2wire modem, I can't use the other computers on line.
Hope someone has an answer.

OK, so it's been awhile since this was posted and I hope you've solved the problem, but on the chance you haven't you might try setting up a new location in the network preferences:
Open system preferences
Click on "Network"
Click on Location:New Location...
Click on Show:Network Port Configuration
Click and drag "Airport" to the top (you can uncheck any of these boxes also if you don't want to use them"
Click Apply Now
Click Show:Airport
Click TCP/IP
Normally Conigure IPV4 is set to "using DHCP"
Click on Apply now
This should work. You may have to use the Apple Menu to set your location - It's a pain but at least you'll be up and running
PB G4 15" Hi Res 1.5 GB   Mac OS X (10.4.5)  

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