Αυτο: How to remove phantom - hidden cards from system. 1 Right-click My Computer and select Properties. 2 Click on the Advanced tab. 3 Click on Environment Variables. 4 Below the bottom Environment Variables window panel (System Variables), click on New 5 For Variable Name, enter devmgr_show_nonpresent_devices 6 For Variable Value, enter 1 7 Click OK to close Environment Variables and OK again to close System Properties Open Device Manager, click on View and then select Show hidden devices from the menu. You can identify the hidden devices by their grayed-out icons. Go to the Display adapters and show your old cards. Right-click the selected card and choose "Uninstall" driver on every one. Restart and ok.