Its being used or you wouldn't have any video since you have the monitor attached to the connection on the video card and not connected to the onboard connector on the motherboard. Looks like you have to get this diagnosed by someone in your area. From what you have told us, you are using the dedicated video card so don't know why you are having issues.
Do you have both 6 and 8 pin pci express power connectors going to the video card?
What power supply do you have?
Do you have both 6 and 8 pin pci express power connectors going to the video card?
What power supply do you have?
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