You may provide the service tag of the computer and the name as it appears on the account via private message (click my username and then click Start Conversation) so that I can check the further course of action.
I had a similar issue; after I reseated the discrete graphics card, it was finally detected, and I was able to install drivers and have things up and running as they should be. If you want to try this fix, I recommend you consult your model's service manual, keep track of the parts as you disassemble, ensure you and your laptop are grounded, etc. I was hesitant to try this even though my laptop was out of warranty, but it's definitely worth a try.
Here's what I have:
I've previously tried:
Thank you for providing the information; appreciate it. Are you comfortable re-seating the graphics card of the computer? If yes, would suggest you to re-seat it and check if you experience the same issue. Please refer to the Service Manual.
Let me know the findings.
What do you mean by re-seating it? Do you mean take out the entire GPU and put it back in? If so, then it still doesn't resolve the issue.
Glad we could help by fixing your issue. In case of a similar situation in future, feel free to reach out to us on Support Site for any help.