My ethernet no longer works now that I configured my new laptop to wireless

I recently connected my new laptop to wireless. Once I did that, my Desktop computer could no longer connect to the internet using ethernet router. This happened immediately after I configured the wireless on my laptop. Please help. Thanks.

Hi,
When I got the new laptop, I had called SBC to help me set up the wireless on it. The helper reassigned a password for my 2Wire wireless account (an easy to remember 10-digit code). After the helper created that new password, I used it to sign onto wireless internet on my new laptop, and it worked immediately.
A minute later, I went to my iMac and it was completely disconnected from the internet. So in order to get on the internet at all on my iMac, I had to set up the airport on it with the new 10-digit code I had used for my new laptop. But I really want my iMac to have DCHP capability since wireless seems slow and sometimes unreliable.
Oh, and I am not using a router. I am just using a switch. I don't understand how it could be a switch problem, however, if I have an old Powerbook (without any wireless capability) connected to the ethernet via wire through the switch, too (the same switch the iMac is plugged into), and it works great. It's just my iMac that can't do DHCP.

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