The other day I was in best buy and im in the process of building a computer so im buying stuff for it. I bought the new saitek eclipse keyboard and the new logitech mx518 gaming mouse. I wanted to try it right away so I plugged them into the usb ports on my g/f's Dell. Well I had no problem while i was using my new goodies but when I shut down her comp, she restarted it to find out that i did something to it because her dell ps/2 keyboard and ps/2 mouse didnt work at all. The rear usb's worked with my stuff and so did her front usb's. i didnt install anything for the keyboard but i did install the companion software for the mouse so that i can set my adjustable sensitivity buttons. Im not sure if i may have accidently turned off anything but i thought everything looked ok. Help me shes getting on my nerves.