ASRock Taichi X399 suddenly dead?

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   Damn, that sucks. 
Another thing we have seen here on occasion is windows updates causing issues. Unlike legacy BIOS of old, the operating system can access and change BIOS info with UEFI. It is remotely possible Windows updated, altered some settings in the UEFI but did not do so correctly and corrupted the settings. 

This is why I suggested pulling the battery and leaving the system disconnected from power for a few hours. If windows update messed it up, that should be all it takes to restore it (windows can't reflash your BIOS so it would only be corrupted settings not the actual firmware). For some reason we often see the UEFI retain it's deeper (RTC and related) settings with a standard CMOS clear. The only way to clear this properly is to remove the battery with the system disconnected from power. 10 minutes should ordinarily be enough but I generally leave it for two to three hours to ensure the settings clear and no residual power anywhere retains them. 

If you have not tried pulling the battery, you can give that a shot. If you have, that is me out of ideas.

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Xaltar Members Profile Send Private Message Find Members Posts Add to Buddy List Moderator Group Joined: 16 May 2015 Location: Europe Status: Offline Points: 22793	Post Options Post Reply Quote Xaltar Report Post Thanks(0) Quote Reply Posted: 12 Apr 2018 at 2:19pm
	Damn, that sucks. Another thing we have seen here on occasion is windows updates causing issues. Unlike legacy BIOS of old, the operating system can access and change BIOS info with UEFI. It is remotely possible Windows updated, altered some settings in the UEFI but did not do so correctly and corrupted the settings. This is why I suggested pulling the battery and leaving the system disconnected from power for a few hours. If windows update messed it up, that should be all it takes to restore it (windows can't reflash your BIOS so it would only be corrupted settings not the actual firmware). For some reason we often see the UEFI retain it's deeper (RTC and related) settings with a standard CMOS clear. The only way to clear this properly is to remove the battery with the system disconnected from power. 10 minutes should ordinarily be enough but I generally leave it for two to three hours to ensure the settings clear and no residual power anywhere retains them. If you have not tried pulling the battery, you can give that a shot. If you have, that is me out of ideas.