So the source of the black-screen was disabling Optimus in the BIOS, the newly released Nvidia driver (526.98) seems to have fixed it, Mux switch hopfully works as intended now.
Hi So I just bought a Dell G15 5520, downloaded Dell Support Center, updated all drivers, updated windows 11 to the latest version available. And just after installing alienware command center I restarted.. And there's nothing on the screen, the machine will power up, but nothing is displayed.  *Prior to to installing AWCC, I disabled Optimus from ths BIOS, I don't know if that makes any difference.    
Dell g15 5520 display stopped working