Question Tiny UEFI change permanently destroys PC

[Brutal_Moose]

Asus 2012 UEFI 16GBDDR3 Laptop N56V(z)
Veracrypt version from april 2023
Win10 22H2 Pro
Encrypted C Windows system partition, then deleted all partitions on disk, then in UEFI, removed Veracrypt in boot menu. It never booted since then. It is always black screen, 100% black, never any text of any kind. The HDMI to external monitor is black too. No other recent changes or damage.

I have tried removing battery, holding power button for 30 seconds. Downloaded UEFI EC update, extracted file, put onto MBR FAT32 32GB USB 3.0, had no effect.

Removed CMOS battery, RAM.

 

[rgd1101]

what did you change in bios?

 

[BFG-9000]

In general, laptop "CMOS" settings have long been saved into flash except for the clock, and so only a very-low-capacity tiny rechargeable battery is usually used in laptops instead of a primary cell. After all, the only thing it's keeping is the time/date and Windows can connect to a time server when it connects to the internet.

 

[Brutal_Moose]

In general, laptop "CMOS" settings have long been saved into flash except for the clock, and so only a very-low-capacity tiny rechargeable battery is usually used in laptops instead of a primary cell. After all, the only thing it's keeping is the time/date and Windows can connect to a time server when it connects to the internet.

I have read that in addition to time, the CMOS remembers the BIOS UEFI settings, that is why I removed it.