This is a stupid question...but my little brother has a Logitech Elite (non-wireless) keyboard. Last time I was there I noticed it was dirty and had crap all in the keys. I promptly beat him for it..jk...but I told him to clean the damn thing. Anyway...supposedly he did...but then a key stopped working so they sprayed it with some of that canned air crap. Now another key isn't working. When he holds down SHIFT the F and G keys don't work and he gets a beep. More than likely, it's the keyboard...but I'm going down there this weekend and wanted to see if anyone could think of anything else I could check in case it's not the keyboard, just so I'm prepared. TIA.