How come once I opened RECentral, there's only sound but no video, and restarting computer or RECentral doesn't seem to work?

This may be due to your CPU being set to power saving mode.
Please turn off CPU power saving (C-State) setting(s) in your BIOS.
Procedures for different systems may vary.
System used: GIGABYTE Z170X-DESIGNARE/GIGABYTE GA-Z170X-Gaming 5 /GIGABYTE GA-Z170X-Gaming 7
Steps: Reboot your PC and hold Delete (DEL) key to enter BIOS.
Go to M.I.T. > Advanced Frequency Settings > Advanced CPU Core Settings



> C3 State Support > Disabled
> C6/C7 State Support > Disabled
> C8 State Support > Disabled

> Save and Exit Setup