Latitude 11 bricked?

My 5175 has occasionally turned off while on, and displayed the message "No bootable devices found". Has always come back after resetting BIOS to defaults and restarting.

Today however it turned off while turned on, plugged in, and not in use, and now won't turn back on. When plugged in the charging light no longer comes on. However, pressing the power button for two seconds causes the light to flash and then stay illuminated, exactly as if the tablet was booting. However, the screen stays black. 

All reset attempts with holding the power button for up to a minute, combining it with the volume keys, etc. have not changed the behaviour.

Does anyone have an idea of what failure this indicates?

Also, if it's something unfixable like the motherboard, can I pop the SSD into another 5175 and expect it to work seamlessly?

Thanks for any