all of the sudden i started having problems opening the cd tray when it is empty. i usually hit f12 or control+e on my keyboard (logitech keyboard set to mimic windows). Now the only way i can figure out how to open it is to go into iTunes, and hit burn cd, which opens the tray. Then i cancel the iTunes burn. I have also never been able to use the Home and End keys when typing in a text box. can others use these? Any ideas on whats happening?