If you installed a new hub, then you have a new network.....just as if you took your printer to another home and expected it to automatically connect to the wireless network there. The printer cannot do that since it has stored the settings to connect to your "old" hub.
You will need to reset the printer back to its original, new out of box settings.....then set it up again to connect to your "new" network.
Thank you, Bob, unfortunately the Mac will not let me install from the original CD as a default message appears and tells me that this particular printer in not compatible with my Mac and the same message advises me to download an updated driver from Lexmark. On going to the Lexmark site the driver refuses to download because the orignal driver is not installed.
The strange thing is that the printer was working fine before BT installed the new hub.
I have put in the new hub details and it's code but the wi-fi will not re-connect with the printer.
I should be grateful for any new ideas.
If you have an older Mac or a PC there, you could use that to install the printer again.
If you don't....maybe you could borrow an older Mac or PC to install the printer.
If you cannot do either of the items above, then you will have to wait for Lexmark to provide a new installation CD that is compatible with the newer Macs.....or.....get another printer that is compatible with Mountain Lion.