Desktop pc will not connect to hub anymore.

I have bt hub 4 a few years and no problem. My desktop is wired to the hub and the laptops and 360 are wireless and they all worked fine from day one.
But last weekend by desktop which is wired to the hub just wouldn't connect to the Internet. But everything else wireless is fine.
I have restarted the hub, nothing.
Checked the Ethernet cable and even replaced it and again still nothing.
I have even backed up my desktop and pushed it back 2 factory setting and still nothing.
But all the time the wireless devices are still working.
I have phoned bt up and hey have done a line check and walked me through a few things but nothing still.
I have even but the hub cd that came with it and followed the step by steps but when it trys to detect the hub and pc it says they are not connected when they are.
It's really frustrating now as I can use my desktop to go online.
Has anyone had this problem or know what is wrong and know how I can fix as it's really baffled me and frustrating me now.
PLEASE HELP!!

Can you confirm the IP address of your hub? It is likely to be 192.168.1.254. From a working wireless connection, browse to http://192.168.1.254 and you should see the hub manager page.
Assuming this IS the IP address of the hub, get a command prompt on the wired PC and type
ping 192.168.1.254
let us know the exact results.
Can you also check the PC network card settings, see what the IP address is set to, gateway IP and DNS server IP addresses.
Charlie

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