When I plug in an add-on graphic card on the PCI-E slot on X8ST3-F, X8STE, or X8STi family boards, there is no video output. What could be the issue?
You have to disable the on-board VGA by jumper in order to have video output on add-on graphic cards. Please refer to the user’s manual in the jumper setting section to see how to disable the on-board VGA.