Why does my airport base station show all green lights but doesn't connect to the internet?

I have an Airport Express Base Station that has been working beautifully up until this morning.  For no apparent reason (changes in ANYTHING), I cannot connect to the internet through it.  Here's the situation:
The light on the airport is solid green.
Aiport Utility shows all is well...the base station shows up, with green light, IP address, etc.
Network Diagnostics shows "your connection to the internet seems to be working correctly."
Connecting the modem directly to the computer via ethernet cable works fine...internet humming right along.
Connecting the modem to the base station doesn't work, even though all green lights and "all systems go" diagnostics.
Wireless access via iPhone and iPad not working, either, so definitely not computer-based issue.
No changes have been made to anything.  I'm running 10.6.8 on a 2007 MacBook Pro.
Can anyone help?
Thanks,
Nancy

Hi Bob,
Thanks for responding.
Does that IP address start with 169, or something else?
The IP address starts with 10.0...
Does this mean that the iPhone and iPad can connect to the wireless network....but not get to the Internet?.....or.....does this mean that the iPhone and iPad cannot connect to the wireless network at all?
They can see and connect to the wireless network, but aren't connecting to the internet, just like my computer.  Sorry for not being clear about that.
Can you look on the side of the AirPort Express to locate the model number?  Hard to see, you may need a magnifying glass. Starts with an "A" followed by four numbers, as in A1264, or A1084, for example.
The model number on the Airport is A1392.
Any insights based on this info?  Thanks for your help.
Nancy

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