Fixing an Acer Nitro: Screen Off, Keyboard Lights On

1. Disconnect primary and RTC CMOS battery.
2. Plug in AC Adapter.
3. Press and hold F2, turn on using the power button.
4. Once in BIOS, reload settings to defaults.
5. Turn off and reconnect primary and RTC CMOS battery.

Note: The above worked on an Acer A515-52N that were exhibiting all sorts of issues: IRQL NOT LESS OR EQUAL, WHEA, random reboots, etc.