After getting a new Logitech keyboard, I've started haveing the strangest problem; I can't hit specific three key sequences. The computer gives a beep and doesn't do what I want, such as in FPSs, I'll hold W to go forward, Shift to run, and A to strafe. THAT works, but if I were to hold D to strafe right instead, it beeps. Any ideas how to fix this or whats causing it? The keyboard is connected through the keyboard port. Would getting an adapter to USB help?