A combination lock and locking pin is provided which includes indexed tumblers operable in any sequence or simultaneously to enter a combination, a channel to protect the locking pin, and a locking pin with nested locking cylinders or a reduced or conical shaped nose to fit different sized latch plates or the area behind a gun trigger. Further, the present invention provides a display device which can simplify the mounting structure of a display panel and can mount and fix the display panel to a casing easily and with high accuracy. The NIC is located in the cutout of the first motherboard and positioned substantially parallel to the motherboard.