Randomly my nice old G4 PowerMac, running 10.4 stopped connecting to the internet. Checking the Ethernet settings, it isn't seeing any information. My cable modem and router are both fine. The router is wireless, and computers receiving the wireless signal work fine. I hooked the modem up directly to the Mac, and it still wouldn't see it. I'm actually a little concerned about a virus or something. Has this happened to anyone else?