Hello I send my laptop to service for cleaning and thermal stuff but when I get back Nvidia GPU doesn't working like it only stands in Optimus mode and games starting glitching because screen mode is getting bugged. I uninstall my driver and download again but it happening again. Some guys mux switch is off that's why u can't switching screen mode  but I can't find mux switch selection on bios or Alienware command center. Model is g15 5530 Rtx 4060. Please I really need some help.