Epson Progression U12 - Manual (Page 172)

3. If you entered an MS-DOS command that you want to stop,
there are special key combinations you can type to cancel
the command. These methods may also work in your
application programs:
Hold down and press
Hold down and press
4. An application program can occasionally lock the computer,
making it unresponsive to keyboard commands. If your
computer does not respond when you type on the
keyboard, you can reset it. Follow the instructions in
Chapter 1.
5. If resetting the computer does not help, remove any
diskettes, turn off your system, wait five seconds, and turn
it back on. Then restart your application program.
If none of these solutions solve your software problem, contact
the software manufacturer for technical support.
Printer Problems
Below are some general steps to follow if you have difficulty
with your printer. If the problem persists and you need more
detailed information, check your printer manual.
You see a port error message if you are having trouble with the
port to which your printer is connected. If your printer uses the
parallel port, you may see error 901; if your printer uses the
serial port, you may see error 1101.
7-20 Troubleshooting