Will not connect to wireless printer, although has done previously.

Hi, I have a medion Akoya E7214 which will not connect to the wireless HP Photosmart B110a printer. It was previously connected to this printer and came up with 'printer offline' message. The computer finds and recognises the printer but will not complete the 'add printer' setup. I have tried using the HP print doctor and re-loading the drivers, software etc to no avail. Please help!!