Switched from DSL to Cable, Can't connect to the internet

Question

After switching to cable modem (Motorola SB5120 SURFboard) from DSL, I can't connect to the internet using my airport express. Everything is green - modem and airport, and the signal on my computer looks like I have full access, but there is a scrolling message... looking for PPPoe host. I have unplugged everything and restarted per the instructions on this site, but get the same result every time. My computer connects just fine using direct connection to the modem. I saw a download for a firm ware update for the express, but don't know how to apply that, either. Any help out there?
Thanks!

Answer 1

Hello mom2gr82. Welcome to the Apple Discussions!
Let's double-check your AirPort Express Base Station's (AX) settings...
AirPort Express Base Station Setup (AX) w/High-Speed Cable Modem
Perform a "factory default" reset of the AX
o (ref: http://docs.info.apple.com/article.html?artnum=108044)
Modem/Router Power ReCycling
o Power-off the Cable modem, AX, & computer(s); Wait at least 30 minutes.
o Power-on the Cable modem; Wait at least 15 minutes.
o Power-on the AX; Wait at least 5 minutes.
o Power-on the computer(s)
Setup the AX
Connect to the AX's wireless network, and then, using the AirPort Admin Utility, try these settings:
AirPort tab
o Base Station Name: <whatever you wish or use the default>
o AirPort Network Name: <whatever you wish or use the default>
o Create a closed network (unchecked)
o Wireless Security: Not enabled
o Channel: Automatic
o Mode: 802.11b/g Compatible
Internet tab
o Connect Using: Ethernet
o Configure: Using DHCP
o WAN Ethernet Port: Automatic
Network tab
o Distribute IP addresses (checked)
o Share a single IP address (using DHCP & NAT) (enabled)
Once you verified that you can get Internet access for all of your computers, you should secure your wireless network. To do so, I suggest that you make these changes:
Change Wireless Security
o Wireless Security: WPA Personal or WPA2 Personal
o Encryption Type: WPA and WPA2
Base Station Options - WAN Ethernet Port
o Enable Ethernet Port (checked)
o Enable SNMP Access (unchecked)
o Enable Remote Configuration (unchecked)
o Enable Remote Printer Access (unchecked)