I am cautiously optimistic

[mojosmom]

that I actually have my Internet back. I took the computer to the Apple Store today, the guy fiddled with the settings, muttering about ISP tech support as he did so. I got home, plugged in the modem, it took me straight to set-up, and now things seem fine. I will not relax until I get through a couple of days with no problems, so when you all are not using them, keep your fingers crossed!