Black screen after enable Scaling GPU

Hello,

 

I installed driver for graphic card Radeon 550x for Windows 7. I had Windows 8.1. Drivers Installed and worked well.

After I enabled Scaling GPU and suddenly screen became black.

How can I switch off Scaling GPU? I can not enter in Safe Mode, I press F8, then boot device - press SSD, then press F8 again, but black screen again.

 

*AMD Graphics Card

     *AMD RX 550

*Desktop or Laptop System

Desktop

*Operating System

     *Windows 8.1. Home 64 bit Professional

*Driver version installed

     Crimson ReLive Edition 17.7.2 for Win 7

*Display Devices

4K Monitor; 3840x2160 (60Hz), Display Port

*Motherboard + Bios Revision

Asus 370x Prime Pro

*CPU

     *AMD Ryzen 7 1700 8-Core

*RAM

     *16GB x 2 DDR4