Don’t you need to install the new GPU card driver, power down your PC; turn off you PSU; swap GPU cards, power up your PC; and, then once you get your monitor display to work with the new GPU card; then and only then uninstall the old GPU card driver; otherwise, won’t you lose monitor display functionality to do everything else, including the ability to power down your PC, if you uninstall the existing GPU card driver first and your monitor display stops working?