PS/2 Mouse

Newer mice use a PS/2 connection instead of a serial connection. The port and the connector are light green, if the manufacturer has followed the standard color scheme.

Connecting or disconnecting a device with a PS/2 connector can cause a power surge to your motherboard, which can ruin it. The damage will not be visible, but it will definitely not be repairable. (I didn't get this warning myself until AFTER I discovered it by expensive, accidental experiment!