Hello, I also have the same problem with my razer blade 15 laptop.

The graphics card (laptop 1660 ti) has not been detected for a long time. So I tried updating Windows, drivers, BIOS and did a factory reset but it still doesn't work and The only usable graphics card is the Intel one.

Can you help me?

Model : Blade 15  RZ09-03009E21

Intel 11th Gen i7- 9750H CPU

Graphics : Nvidia GTX 1660 TI Laptop