Why has my iMac Internet Connect disappeared?

After several years of regular internet and e-mail activity, a recent attempt to connect resulted in a dialog box saying: 'Internet Connect - The selected communication device does not exist. Please verify your settings and try again'. I never touch my settings!
My situation is not helped by being a long way from the telephone exchange - consequently I can only receive a very slow bps and frequent disconnects. Could it be that my lack of up-to-date iMac Firmware is causing this problem?
I have taken my work laptop, an iBook G4, home, and plugged it in to the network - it connects OK, so the problem resides with the iMac. As it takes so long to download updates, is it possible to download them at work and transfer them to my home iMac via a memory stick?
Any help would be appreciated.
Thanks
Richard
iMac G3 Mac OS X (10.4)
iMac G3 Mac OS X (10.4.1)

I just reread your original post. It's possible your internal modem has died. 'Yikes! 'Hope it hasn't. Does it dial and try to connect? Have you tried reselecting it in the network CP? Have you run "Repair Permissions" in the Disk Utility application?
Your firmware version should be 4.1.9f1.
Yes, transfering update downloads on a thumb-drive would work fine.
Yea, all computers are great when they work, and a pain when they don't!
David

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