Are you using the onboard display or an extension slot and card? Gigabite has the ability to turn off and on both the AGP or PCIeX16 slot and the onboard video in the bios. (Noting: some 945 variations have onboard video and some don't, some later versions of the 945 have PCIe X16 slots, some older versions have AGP X8 slots) Check to make sure your bios doesn't have these turned off for what ever you're using.
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Are you using the onboard display or an extension slot and card? Gigabite has the ability to turn off and on both the AGP or PCIeX16 slot and the onboard video in the bios. (Noting: some 945 variations have onboard video and some don't, some later versions of the 945 have PCIe X16 slots, some older versions have AGP X8 slots) Check to make sure your bios doesn't have these turned off for what ever you're using.