Oh sorry. My bad.
Method 1:
First, I would suggest you to run the following Microsoft Fixit to get the problem automatically detected and fixed. This fixit checks if the device is currently disabled or turned off or the driver is not installed.
Hardware devices are not working or are not detected in Windows.
http/support.microsoft.com/mats/hardware_device_problems/en-us
Method 2:
Sometimes, some devices in device manager are hidden due to corrupt or missing drivers.
Follow the steps below to show hidden devices in the device manager and troubleshoot accordingly.
Press the Windows key + X
Select Command Prompt (Admin)
Type set devmgr_show_nonpresent_devices=1 and hit enter
Type Start DEVMGMT.MSC and hit enter.
Once in Device Manager hit the View menu and select show hidden devices.
From here, remove each instance of the Nvidia card you see as well as each unknown device. Exit Device Manager and reinstall the latest drivers you can find for your graphics card.
After you install the drivers, reboot and see if you get any different results.
Method 3:
If methods suggested above does not help, I would recommend you to contact ASUS to get chipset, BIOS, graphics card, drivers installed properly.
Also check with graphic card support site or refer the manual regarding the changes to make on the BIOS.
BIOS Disclaimer:Modifying BIOS/ complementary metal oxide semiconductor (CMOS) settings incorrectly can cause serious problems that may prevent your computer from booting properly. Microsoft cannot guarantee that any problems resulting from the configuring of BIOS/CMOS settings can be solved. Modifications of the settings are at your own risk.
Hope this helps. Please let us know the results. Feel free to write us back for any further assistance, we’ll be glad to assist you.
CREDIT: http/answers.microsoft.com/en-us/windows/forum/windows_7-hardware/nvidia-graphic-card-does-not-show-up-in-device/d773c616-7767-47c0-94be-b35d77727941