im experiencing the same problem as the guy a few threads below! Except mine is with a wireless connection. A few days ago when i got home for break, i could easily access the wireless network set up in my home. But for some reason, the signal is still being recieved and the airport is set up but i cant access the internet. Unfortnately, its so depressing im using a PC. But...i am connected to the internet via Airport, Internal Modem is not set up (this is what it tells me in System Preferences. As for how my IPv4 is configured, im using DHCP. I have my airport joining any network automatically. Someone please help! I tried everything..i disconnected from the network then restarted my computer. I've tried some solutions from the other thread but most of them didnt work since he is trying to connect to a base.