Issue resolved for installing Omarchy an Asus Rog Strix x870-I & NVDIA RTX 3060. No more black screen/monitor turn off!

[rAlexander89]

Problem TL;DR: Black screen of death then motion would shut off. Ctrl + alt + F2 didn't help.

Solution:

• unplugged power
• turned off power supply
• reset CMOs by holding down the button on the back of my mobo for 15 seconds.
• removed graphics card (rtx 3060)
• plugged in the power, turned on power supply
• selected to boot as 'Other OS' from the bios screen.
• disabled fast boot
• saved and exited
• when I got to this screen below, I pressed 'e' to enter two parameters 'nomodeset acpi=off'
• booted from the relevant option
• did not select Esperanto as my language!
• I was off to the races!

Here’s what those kernel parameters do:
nomodeset:
• Disables Kernel Mode Setting (KMS)
• Prevents the Linux kernel from loading modern graphics drivers
• Forces the system to use basic, generic display drivers
• Essential when your graphics hardware isn’t properly supported yet
• Lets you get a working display to complete installation
acpi=off:
• Disables Advanced Configuration and Power Interface (ACPI)
• ACPI handles power management, hardware detection, and device configuration
• Sometimes newer motherboards (like your X870) have ACPI implementations that confuse Linux
• Disabling it forces Linux to use simpler hardware detection methods
• Helps with boot hangs and hardware initialization issues
Why you need both:
• nomodeset solves the graphics/display problem
• acpi=off solves motherboard compatibility issues with the very new X870 chipset
After installation:
• You can remove these parameters once you install proper drivers
• They’re just temporary fixes to get the installer working
• Your final system won’t need them (especially once you reinstall the RTX 3060 with proper NVIDIA drivers)