A retractable cable combination lock assembly according to the present invention can protect the newly designed Macbook pro with retina display and Macbook Air series and traditional computer with or without Kensington lock slot from theft by securing the laptop via the thunderbolt slot to an immovable object such as a piece of furniture. The lock assembly of the present invention can also be designed to plug into the USB port or HDMI port of Macbook Pro with Retina display, Macbook Air laptop series, and traditional computers with or without Kensington lock slot to lock the computer rather than using thunderbolt port.