Linksys WRT400N - Unable to Connect to 5GHz Band

Good Evening -
I am on my last nerve regarding my situation and I am hoping someone on this board can help me in some way, some form. My Linksys WRT400N router is not under warranty anymore so I can't receive any assistance through Linksys.
I have a Dell Vostro 3400 running Windows 7 Professional 64-bit. The wireless card in the Vostro is a DW1520 Wireless-N Half-Mini Card. This card can operate in the 2.4 GHz and 5 GHz band spectrum. Obviously, the Linksys WRT400N is a dual-band router and broadcasts in the 2.4 GHZ and 5GHz band simultaneously.
I originally had a DW1501 Wireless-N Half-Mini Card. Apparently, there was a known issue with this card with regards to connecting to a 5GHz frequency. With the DW1501 I was never able to connect to the 5GHz band ,,, the card would "see" the 5GHz band but it would never be able to connect to it. While on a support call with Dell wireless, they admitted that the DW1501 has an issue with actually connecting ("seeing") to a 5GHz band.
Dell offered to replace the DW1501 card with the DW1520. So, now my Dell Vostro has a DW1520 and it is able to "see" the 2.4GHz and the 5GHz bands. I am actually able to connect at 130 Mbps on the 2.4GHz band which is better than what I was connecting at ... which had been 65 Mbps. Now, the DW1520 card can also "see" the 5GHz band AND it can actually "connect" to the 5GHz band. When I "connect", I connect anywhere between 170 and 243Mbps, or thereabouts. So all is good until I actually open a browser and try and surf the net. When I do this, nothing happens ... it's like I am connected to the Internet but not really. So then I have to disconnect from the 5GHz and connect back the the 2.4 GHz band.
I spent nearly 2 hrs. on the phone this afternoon with another Dell technician trying to find out why I could connect to the 5GHz band but not actually surf the Internet via a browser. After 2hrs, the Dell technician could not find a resolution. However, we have possibly narrowed it down to the Linksys WRT400N router. At this point, I no idea what the issue is. The Dell technician said that I may have to re-install Windows 7 Pro 64-bit. I totally disagree. I have downloaded all recent DW1520 drivers and the Linksys WRT400N has the one and only firmware version. The Dell tech also recommended "resetting" the Linksys WRT400N. I have not done this yet ... but will.
So ... I don't know what else to do or where to turn. Is there a setting in my Linksys WRT400N router that I am not aware of that will allow me to connect to the 5GHz band? I have disabled my MacAfee firewall ... nothing. I have checked over everything I can think of ... I have researched the Internet for the optimal settings for the Linksys WRT400N. I have made those changes. Nothing. I don't have any IP address populated within the Wireless MAC filter settings within the Linksys WRT400N. I have done the ipconfig steps and have "refreshed" and "renewed" the ip addresses.
What leads me to believe that there is something not set correctly with my Linksys WRT400N (or maybe it's my AT&T Siemens modem that provides the gateway to the Internet) is that I am seeing the EXACT same issue that a state above with my Dell Precision M4400 Mobile Workstation laptop. That has a Intel WiFi 5300 ABGN network card in it. Same thing ... it actually connects to the 5GHz band, but I can't surf the net.
Finally, when I go to the Linksys WRT400N setup page and I go to Wireless > Wireless Basic Setup and change the Network Mode for the 5GHz band from Mixed to Wireless-A Only, I can actually connect to the 5GHz band but only at 54Mbps.
So, I am at a loss. I am not sure what to do, where to look or turn, nor what to or what not to configure. Any advice on optimal network settings or anything regarding this post would be greatly appreciated. This is like buying a nice sports car and not being able to get out of second gear. What's the use?
Thank you in advance.

Most likely the router. you said that 2 different laptops have the same EXACT problem. Try this (in order): Reflash the firmware, reset the router then reconfigure the wireless settings. Set the channel width and channels to AUTO.

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