T1650: UEFI + Secure Boot enabled: Cannot boot anymore
yesterday I wanted to install Windows 10 Enterprise on my T1650 test machine. Before doing so, I successfully updated the BIOS to A20. After updating BIOS, I've enabled UEFI + Secure Mode, saved the changes and... couldn't start the PC anymore. When turning the PC on, monitor immediately goes into power saving mode, there is obviously no signal coming from the PC. Removed the Nvidia Quadro NVS 300 and plugged the monitor into board's VGA slot, no success. Tried to clear the CMOS (battery out, jumpers), nothing helped.