Hi @amiratashi
Perhaps check in BIOS to see if there's an option to disable the AMD GPU.
If there's not, there's some reason why the GPU is not communicating with the I/O chipset on the motherboard so you will have to open it up and see if anything obvious is wrong. After that you may need the schematics to find out what's happened.
Here's the [https://download.lenovo.com/consumer/mobiles_pub/ideapad_110-14_15isk_hmm_201607.pdf|hardware maintenance manual] that will help gain access to the motherboard