Manually enabling a graphics card enables you to fully utilize its power. Regardless, you will almost always have to manually enable the graphics card on computers that don't support plug-and-play. It's a simple process consisting of just a few steps.
Login as an administrator to the PC and navigate to the Control Panel.
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Click on "System", and then click on the "Device Manager" link.
Search the list of hardware for the name of your graphics card.
Right-click on the hardware and select "Enable". Exit and save changes if prompted.
Make sure the on-board graphics unit is disabled when enabling a freshly installed graphics card.