Comcast Can't Connect

I moved from Verizon DSL and changed to Comcast. The tech spend 5 hours trying to get my internet working via direct Ethernet connect and via the Airport Express; neither worked. It did work on his PC hardwired but not via the Airport.
It won’t connect via a hardwire connection directly from the modem or via the Airport Express. Comcast checked the modem connection and said I have valid data transmitting to the modem. They also said that the modem is provisioned.
To troubleshoot both connected via Eithernet and Airport Express I have done:
I have run the Mac Network Diagnostic numerous times and it validates through to the Internet, where it says that it fails. However it does say that there’s a valid internet connection detected. Safari and Firefox won’t load any pages.
The Airport Express has been reconfigured about 5 times with the new modem but it’s just not finding the internet no matter what I do. The computer and the Airport do successfully communicate: It finds the remote speakers so I know it does communicate.
I let everything power down, even unplugged from the wall and left of for over an hour to clear any residual IP address that may have lingered (as per one of the Comcast techs).
The PPoE options are blank and it’s set up to connect via DHCP. The DHCP option will give an address but I have noted that sometimes it takes an address from the modem (69.XXX) and other times from the Comcast signal (either 225.XXX or some other number)
Any ideas??
Mac Book Pro Dual Core!   Mac OS X (10.4.8)  

Hmmm. What happens if you connect the cable modem directly to your ethernet port?
What does it say under the System Preferences | Network section? Or even in the Network section for the Ethernet connection?
Do you have the Configure IPv4 set to Using DHCP or are you trying to force a static IP (in which case you need to be sure and have your DNS and Gateway information as well)?
Its Comcast, and with an authorized (provisioned) modem the signal just flows (unlike with DSL). Get things working with your Mac directly, then attack the airport.
With the AX, Airport Express, try using the reset button to get the unit back to factory settings and try again.

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