Can anybody help as to why my keyboard won't type after I changed my graphics card? On start up with the new card in place everything works fine, though slower and with a 'zoomed in' feel, as I'd expect as I haven't had chance to install the new drivers yet, but when I get to the log in screen my keyboard won't allow me to type in my password. I tried putting the old graphics card back in, but there's still no response to any typing apart from the key that puts the computer on standby. It's a wireless usb keyboard and I've tried it on a friends computer and it still works fine on his. Any ideas to get it working again?