Laptop not using discrete graphics

[Jcmaster]

Hi, I'm not new to the forum but I have never posted anything before this.

Last year I bought an Asus tuf gaming laptop model: fa506, Ryzen 7 4800h and an Rtx 2060, the only thing that I ever did to the laptop is replace the thermal paste with Liquid Metal, I've done it in multiple systems before and it's a well done job, but weeks ago I started noticing lag while gaming I had to gradually change the graphics settings on all of my games until I could only play in all low settings and still have lag (very low fps, some crashes etc...)

 

Trough a lot of troubleshooting I got to the conclusion that the laptop is not using the discrete graphics, it's using the integrated vega graphics for everything that's why i have a bad performance while gaming, whenever I try to benchmark the laptop it always uses the and vega graphics and it gives me very low results, I tried to search on how to manually switch between cards with no luck.

Maybe it's a hardware problem, that's why I'm asking for your help, to either find the problem or to find a recommended technician that can fix this, it's worth mentioning that neither best buy not Asus made valid my warranty, I knew that this would happen if a changed the thermal paste, but they also don't want to fix it, they just offer me a new laptop with $100 discount, but I want to try and fix this one. Also, I checked all of the circuits surrounding the apu under the microscope and I can't see the slightest sign of liquid metal on any of the components, not even on the bottom of the gpu and apu chips.

 

I already tried to reinstall windows several times, I reinstalled several versions of the drivers, both for the rtx and the vega graphics, temps are not a problem, the laptops always ran cool, I always checked, even before the failure, also it's not thermal throttle, the cpu works like a charm, I already replaced the ram and ssd's.

Thanks in advance for any info or hint that you may have, have a great day