Acer 6800 Series - Manual (Page 34)

3 Setting up your computer 28
Connecting a monitor
To connect a monitor, simply plug the monitor cable into the monitor port
(blue port) located on the rear panel of your computer .
Note: When a VGA card is added to the PCI-E slot, the monitor
should be connected to the add-on card and the on-board VGA
will be disabled.
Note: Refer to the monitor manual for additonal instructions
and information.