Cannot configure AE with Comcast Internet/"Scientific Atlanta" Modem

Question

I used to have ADSL overseas, now I cannot reconfigure my AE to set up my wireless network with my cable internet connection. I can connect to the internet with the ethernet cable just fine.
Comcast says it should be fine with automatic under DHCP setting. But they do not provide support for Airport.
Reading some of the suggestions on this forum, I tried to reset my AE to the factory setting and now my computer cannot detect the base station at all.
Any suggestions?

Answer 1

AirPort Express Base Station Setup (AX) w/High-Speed Cable Modem
Modem/Router Power ReCycling
- Power-off the Cable modem, AX, & computer(s). (If possible, leave the modem off overnight.)
- Power-on the Cable modem; Wait at least 30 minutes.
- Power-on the AX; Wait at least 5 minutes.
- Power-on the computer(s)
Perform a "hard" reset of the AX
- (ref: http://docs.info.apple.com/article.html?artnum=108044)
Setup the AX
With the network components powered down, set up the AX, using the AirPort Admin Utility, connect your computer directly (using an Ethernet cable) to the Ethernet port of the AX, and then, try these settings:
AirPort tab
- Base Station Name: <whatever you wish or use the default>
- AirPort Network Name: <whatever you wish or use the default>
- Create a closed network (unchecked)
- Wireless Security: Not enabled
- Channel: Automatic
- Mode: 802.11b/g Compatible
Internet tab
- Connect Using: Ethernet
- Configure: Using DHCP
- WAN Ethernet Port: Automatic
Network tab
- Distribute IP addresses (checked)
- 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:
AirPort tab (optional)
- Create a closed network (checked)
Change Wireless Security
- Wireless Security: WPA Personal or WPA2 Personal
- Encryption Type: WPA and WPA2
Base Station Options - WAN Ethernet Port
- Enable Ethernet Port (checked)
- Enable SNMP Access (unchecked)
- Enable Remote Configuration (unchecked)
- Enable Remote Printer Access (unchecked)
Wireless Options
- Transmitter Power: 10%
Access Control tab (optional)
- + <add the computer(s) that will access this wireless network>