I have tried to connect a PS2 KVM switch to a Dell GX620 (USB only - no PS2) through a PS2>USB Y adapter. The mouse works but the keyboard is hit or miss. When it does work it will act as if the keys are stuck. I am searching for a solution to prevent having to buy the serial/PS2 port from Dell x 3 that connects to the motherboard. This would also save a slot. Thanks in advance.