Dell P2310H Monitor - Manual (Page 31)

2. Connect the white (digital DVI-D) or the blue (analog VGA) or the black (DisplayPort) display connector cable to the corresponding video port on the back
of your computer. Do not use three cables on the same computer. Use all the cables only when they are connected to three different computers with
appropriate video systems.
Connecting the white DVI cable
Connecting the blue VGA cable
Connecting the black DisplayPort cable
NOTE: Do not connect the blue VGA , the White DVI and the black DisplayPort cables to the computer at the same time. All monitors
are shipped with the VGA (blue) cable attached by default.