Epson Progression U12 - Manual (Page 42)

RESET button
If resetting the computer does not correct the problem, you
probably need to turn it off and on again to reboot it. Remove
any diskette(s) from the diskette drive(s). Turn off the
computer and wait 10 seconds. If you do not have a hard disk,
insert a system diskette in drive A. Then turn on the computer.
locking the Computer’s Cover
You can lock the cover onto the computer to prevent
unauthorized users from accessing its internal components.
To lock the cover, insert the key as shown on the left and turn it
clockwise. To unlock the cover, insert the key as shown on the
right and turn it counterclockwise.
Using Your Computer 1-23