This must be a game for dell. I also have 9400 upgrade with ultimate. Netgear 824 w/1390 card. Sees internet w/cable, as soon as I unplug I lose service. Have tried everything I can think of! Ya think maybe there is a problem with them? Will be glad to post findings when I get an answer!

Well, after hours and hours of chatting with Dell, even having one of their CS Reps take control of my computer and try to fix the problem and absolutely no success with them, I managed to fix the problem myself, FINALLY!  I am not quite sure if this will work for you but I'll at least pass on the info so you could try.  It seems as though the problem is with the info the wireless card in the laptop sends to the router.  Apparently it sends the wrong MAC address info to the router.  What I did was, on the laptop, go into control panel.  Switch it to classic view.  The last icon on the list should be wireless configuration, if not the last icon, it should be in there somewhere.  Next, click on the information tab.  Somewhere in the middle of that window it should display the MAC address of the laptops wireless card.  On the computer where the router is hooked into, go into the router configuration and go into the advanced wireless settings and the click on the setup access list button.  On the this screen you should be able to enter in the MAC address you got from the laptop, just the letters and number and not the colon between each.  Click add then apply, make sure the laptop is not connected directly into the router at this time though.  Right after doing this my laptop all of a sudden worked and has worked ever since without a problem.  I compared the MAC address the laptop was sending to the router when I had it directly connected to the one I physically found in the laptop and they turned out to be completely different.  After seeing that, it's the only thing possible I could really blame the problem on.  Try this out and let me know if it worked out for you, hopefully it does.  Any questions on any of the steps just let me know.  Hope it works!

Luckily Dell managed to fix it using remote access after hours of speaking with Netgear, ISP and Dell.  They were accessing parts of the laptop that I have never seen and can't believe you are expected to do that on your own.  There must be loads of people having probs with this.

Glad that we are both sorted now !

Thanks for the info and I'm sure it will help out a lot of others with the same problem. 

The reason there are two different MAC addresses is because you have two different networking devices. Each network device gets it's own MAC address. Therefore your Ethernet nic (for when you are hard wired to your router) has one address and the wireless nic has another. This is normal.