IP address missing, cable company says its my iMac

We've have Road Runner high-speed access for more than a year, no problems.
Last week, we started getting "You are not connected to the Internet," or REALLY slow/incomplete downloads, but it was hit or miss. Called the cable company, they had me reset the modem, and we were able to connect. But then, the same problems started happening. Called back, and their Level 3 tech person had me try to reset/fix the network settings. We got as far as naming a new location, and choosing Ethernet, but the IP address is no longer in the field. We tried again, restarted, no connection. I'm kind of afraid I/we messed something up in doing the reset, but not sure.
Also, I don't think this is connected, but I had to reinstall the system software last weekend because I tried to download an OSX update from one of the those "New Software is Available" messages, and the system completely froze on restart. But, I didn't lose any files, and I was able to get back online after that happened, so I don't think that's part of the problem.
Please help...the company I work for is on the block, and I can't afford not to have email at home if I suddenly find myself without an office.
iMac G5 20"   Mac OS X (10.4)  

Sorry...should have mentioned that last night, the cable guy came out and replaced the modem and cable. Still no connection.

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