You need to make sure you have the DSL modem plugged into the WAN ethernet port and the PowerMac plugged into the LAN port. If you swap them your wireless network gets exclusive access to your Internet connection, but only one computer will be able to connect. Worse, the NAT firewall within the base station is bypassed, so any <strikeout>slimy, no good, despicable jerk</strikeout> undesirable character could potentially view or damage your files.