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My guess is a loose display cable. With laptop on table with it's back off, the cable is near the left fan cable, it's the larger connector. Reconnect, reassemble, and test.

Good Luck

Now go back into your Device Manager and try to update your keyboard driver:

Is your keyboard responsive now? If not your keyboard controller on your motherboard is bad. Requires motherboard...

Take a look at the picture below:

The red arrow is pointing to your laptop's internal keyboard.

I want you to uninstall all the Dispositivio de teclado HID devices (right click, unistall).
...

Please post a copy of your Device Manager with expanded Keyboards.

Here's a picture of mine:

At the bottom of the ASUS G531GT Download Center page you can find the Hot Fix:

Here's the link to the download:
...

It's a 5-year old laptop, out of warranty, official ASUS parts would be expensive. Besides he didn't include the laptop's entire label (G771J?).

The model doesn't show up in the European market....

Check your ASUS Download Center for your model. There is an update for the Nahimic Component Driver:

...

Looks like a 2015 model. Here's a link to disassembly:

https://www.youtube.com/watch?v=wQGGQgBJXb0

Rather straight forward, just remove battery, remove all the small covers on the back (hard...

Here's a link to download the ASUS Driver DVD. For details as to how to handle this ISO file look at My "Sticky" at the top of this sub-forum page labeled "Make a copy of your eSupport Folder before...

Plug-in an external keyboard, copy your important data to a USB, include a copy of the eSupport Folder, format your OS drive, install a fresh copy of Windows 10, then using the ASUS Installation...

I was reviewing the NVIDIA link you sent earlier about what should show up in your Device Manager and discovered another NVIDIA link:
...

It's a 10 year old laptop, time to retire it, bro!

Was your laptop purchased in another country without OS?

Return laptop to ASUS (RMA) or bring to local service for repair.

Here's a link to a site that has your ASUS Driver DVD:

https://www.asustreiber.de/downloads/download/60-windows-10/806-g703gi-treiber-dvd

The smartest action would be to burn a copy of this...

Here's pictures of both G750JX and G75VW hardware and descriptions:

I have to describe both models as having built-in 3D emitters. The emitter area in the G75VW picture (Item 1) lights-up green...

Here's some supporting pictures for you. I installed SnagIt on the G75VW-DH73-3D laptop and I took a picture of the top of the display bezel showing the camera and 3D emitter. Then transferred...

If still under warranty, return the laptop, for repair, replacement, or refund.

Good Luck

You either have a bad display or the display to motherboard cable connection needs to be reseated or the cable replaced.

What is the full name of your laptop? G750JX ?????

Got me curious. So I got out my old ASUS G75VW-DH73-3D laptop, a pair of NVIDIA 3D Vision 2 Wireless Glasses, and a 3D Blu-Ray DVD of Avatar.

At first I couldn't get the 3D Glasses to sync with...

Burn yourself a DVD using that ISO file.

Use the ASUS Installation Wizard (AsInsWiz.exe) found on the Driver DVD to install the original ASUS drivers and programs. Yes, I believe the Windows 8.1...

This is the latest Realtek audio driver from ASUS:

https://dlcdnets.asus.com/pub/ASUS/nb/DriversForWin10/Audio/Audio_LEGACY_Realtek_Win10_64_V6088581_driver_only.zip.zip.zip

If you have any...

Well we know there are only two memory slots and that there can be no more than 16GB in each slot for no more than 32GB total. Crucial spells out DDR4-2400 or DDR-4-2666.

ASUS most likely filled...

1. Please provide the specifications of the RAM that you installed. (make, speed, size)

2. Please provide details of what SSD you installed. (make, model, interface, storage size)

Here's a link...