AirPort Express doesn't work with SB5100

I'm helping a friend set up a new AirPort Express  MC414LL/A Model A1392 (802.11n) with her existing Motorola SB5100 DOCSIS 2.0 cable modem. I was able to setup the AirPort Express from her iPad with a network name and password. Also upgraded the firmware in the AirPort Express. However, the Airport Utility App on my iPad and iPhone connected to the AiPort Express, but showed no connection to the Internet. Furthermore, the PC that had been working fine when connected directly to the SB5100 could not make an Internet connection when connected to the AirPort Express.
I brought the AirPort Express home and connected it to my Verizon FiOS Actiontec modem and it works fine - my iPhone and iPad connect to it and through it to the Internet.
I'm wondering if the SB5100 is incompatible with the AirPort Express??

It should work.
Power down the modem and leave it powered down for a long time, as much as a half hour or longer is sometimes required. While it is powered down, disconnect its coaxial cable. Literally unscrew it and leave it that way.
Connect the Express to your modem, leave them connected, and do not disconnect them from one another without powering down the modem again.
Re-connect everything including power and let the devices complete their startup sequences. This usually takes a moment or two.
If that does not result in success, "hard reset" the Extreme or Express according to the instructions below and start over from the beginning.
If you still have trouble, contact AppleCare because you have done everything reasonable to get it to work.
To "hard reset" an AirPort Base Station: make sure it's powered up, then press and hold its tiny reset button and keep it depressed for five to ten seconds, long enough for its LED to flash amber rapidly. Release the reset button. Then, the LED will glow amber steadily for about a minute. Then, it will flash amber, slowly, about once every second or two, waiting for you to configure it with AirPort Utility.

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