My Belkin wireless keyboard has been working fine then Tuesday morning, turned on the computer, tried to type in a web page in the address panel and nothing would type. Have disconnected wireless keyboard then plugged it in again, have tried resetting it, have tried 2 other usb keyboards, have tried a ps2 keyboard, have tried starting in safe mode but nothing will work. The volume, backwards/forwards, media, favourites keys all work on the wireless keyboard but no letters or numbers will work - its as though there is a lock on but I've tried all the keys to try and get it to work but nothing works. Help!!!