Zoom Cable Modem and True Mobile 1184 Problems

I recently replaced my rented Charter 3Com cable modem with a Zoom 5140 modem and am having problems connecting to the internet when using the Dell 1184 Router.

• Zoom modem works fine when I connect directly to the Lap Top (3Com 3C920 Integrated Fast Ethernet Controller)
• System worked great using the 3Com cable modem.
• The Internet is not working when using the 1184 Router and the Zoom Modem.
•  Turned off Router overnight and pressed the Reset Button several Times
• Called Charter Support and they stated everything should be working
• Internet light on router is on. And the the ethernet light on the modem is also on.
• Diagnosis on the Router shows (Exact Spelling) Notonected for the Cable/DSL

Please Help,