Problem:
The touch display controlling the beamer screen and other technical stuff in the lecture room went black and /or there is a non-stop "beep" sound.
Cause:
There is an emergency battery unit under the table in the cabinet. This UPC is most likely producing the continuous "beep" sound.
Problem Solving:
Get the key for the electronics cabinet under the table.
Unlock the cabinet with the key.
Try to stop /reboot the UPC via the button on the unit.
See if there was a fuse blown through a voltage spike.
Activate the fuse again.
Check the controller panel of the display.
Try to reboot it.
Give it multiple tries.
Go to and unlock the fuse cabinet outside the lecture room.
Check the fuses there also.