|What fo you mean the PC one?|
If you mean a 15 pin VGA socket with the pins in three rows then yes,take it out. You only need one input source at a time.
A HDMI cable to connect the HDMI ports can easily be obtained at any computer stores or on-line.
The HDMI cable will give you better quality as well. It cuts out the digital to analogue and analogue to digital conversion required with the 15 pin VGA cable. With HDMI its digital all the way.
Just as an aside, if you wanted to run two monitors, the chances are that if you were to plug the VGA cable into a second VGA monitor you can have two monitors.
You would have to check the Graphics specifications but most graphics hardware with both HDMI and VGA outputs can run two monitors simultaneously.