I have a Dell M4700 laptop, until now everything worked flawless. I upgraded it a bit, means, that I installed an mSATA SSD and a bigger HDD, cleaned/put fresh thermal compound both on the CPU and GPU. I installed a fresh Windwos 10, and I noticed that neither my system, but also the BIOS cannot see the GPU, only the Intel HD graphics.
I checked the device manager, there are no errors or not visible hardwares.
I opened the laptop, I removed and inserted again the GPU, but everything is the same.

Please help me.