A:Answer I am assuming you are referring to a HDMI monitor cable when you say HDM. This unit (HP Model: 550-a114), does not have a HDMI port. It has a VGA port so you would need to get a VGA to HDMI adapter to use a HDMI cable. Be sure and check your monitor, it might (many do) have both HDMI and VGA input ports. If that is the case, you would not need the adapter, just a standard VGA monitor cable. The unit does not include any monitor cable as sold.