Selecting output from multiple graphics cards

[Nefarious]

I have a desktop that has on-board graphics (with VGA output) but I also have an MSI 960 GTX card.

Once the graphics cards are in, the computer stops outputting graphics to the VGA, is there anyway to force it to output?

 

[ChocoViennese]

It will still be using the on-board vga, but will output via the external GPU ports. I would imagine, possibly, there is a BIOS setting that may help.

 

[Armageus]

Depends on the PC/Motherboard - most recent PC's, and most main brand motherboards e.g. Asus/Gigabyte/MSI etc will have an option in the BIOS to choose what happens e.g. whether the onboard is disabled.

Older motherboards and prebuilt oem PCs e.g. HP/Dell can be hit and miss as to whether the onboard can coexist with "discreet" PCI-E graphics cards.