I have 6 IDENTICAL Win XP pro SP 2 machines. Bought at the same time, made by the same builder, all identical components and software. There was a power glitch this afternoon, now 3 of them can see the network and 3 cannot see the gateway. All PC are on APC power strips and router, swithc and modem are on APC UPS. Router & Modem has been power cycled, machines have been power cycled, cableing has been checked. Netdiag shows The gateway is unreachable, I can ping 127.0.0.1 and localhost, but not the machine IP, router, or other machines on the network. Also no internet access is available for the 3 with gatewat issues. I have used both netsh int ip reset and netsh winsock reset. All the data on the network share is fine.