Surface Book 3 Nvidia Graphics card disappears after updates.

Contact Surface customer support or Nvidia customer support - it can be something small you won´t come up with easly. Generally (so I was told) if the card is gone under the hardware manager without you having unistalled something, it ain´t looking good. Check there under "hidden devices" too (under view). It´s important if it shows there. If some strangely named card shows under the manager, that´s important too.

The Surface customer support can remotly access your laptop and run diagnositics and check BIOS etc. Do try it out before sending your laptop in. I had a different issue with the camera suddenly vanishing, they fixed it for me in no time.

The "hardware changes" button showed nothing. As I´m not a technology geek, I contacted NVIDIA custommer support. They asked me, if the card was showing under the hardware manager, which it was not. However, they didn´t tell me to look under "hidden" devices. There it was. When opened it was saying code 45, device detatched. That´s how I came to this thread. At this point I have been 4 hrs into applying solutions, chatting with NVIDIA, installing sfotware and firmware, booting and rebooting, going ito BIOS, you name it. NVIDIA said I should send my laptop in to have it repaired. So imagine my surprise when such a f*ing tiny move as detach and reattach the screen did the job. This should be included into all kinds of manuals, automatic help programms etc. I mean, I almost sent my laptop in. Imagine the costs for this on both sides.

I tried it on both too, still having problem.

Dozens of times in an evening!? That's send it back rate for me. I hope it is still under warranty.

I wouldn't go that far! If it works for you then it is a solution. Others should know and try it, might be their issue as well. It is better to have us informed than not. :)