Wireless Internet access via requires unplugging cable modem -

I have a brand new MacBook Pro with Snow Leopard (10.6.1) and Airport Express (7.4.2). I have high speed Internet via Comcast/cable modem. I spent 30 minutes with the Apple Tech Support folks and was finally able to get wireless internet access. However, after I shutdown and reboot, the only way I can wireless internet is to unplug the internet cable from both the wall plug and cable modem and unplug the modem, both for about two minutes. This isnt what I had in mind when I crossed over from the dark side (PC laptop world) and am having buyer's remorse. Does anyone know how I can fix this problem (i dont want to unplug cables before each session on the internet)?

Mr. Timmons,
Thank you so much for the response.  I thought the complete reboot would work, but apparently not.  I followed the directions precisely, even waiting a few minutes longer than suggested for each of the steps.  My air express is still blinking yellow.  I think the issue has something to do with the DHCP and the IP address which are diifferent. The IP address is one series of number (starts with 169), and the LAN IP address is another number (starts with 10). Status on airport express show yellow for internet connection, and yellow for no DSN servers. When I go to the internet tab of airport utility, it shows the iPv4 address starts wutg the 169 number. When I click on the network tab, the DHCP range starts with the 10 number.  When I open the Network Options window, the iPv4 DHCP range starts with the 10 number.  I am at a loss as to how to get them to match up (with either the 169 number or the 10 number).  V/R sjbgtmo

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