Epson EL 3S/33 - Manual (Page 89)

If you installed a display adapter card, make sure your monitor
and display adapter match. Also check to see if the card’s
switches or jumpers and the jumpers on the system board are
set properly. See Chapter 3 for system board jumper
information.
If you are running an application program, see if you need to
set up the program for the type of monitor and display adapter
you have. Also make sure you are using the appropriate
monitor and display adapter for your software.
If your application program requires a monitor that supports
graphics but you have a monochrome monitor, the results
The power switch is on but the power light is not on.
Turn off the monitor’s power, wait five seconds, and turn it
back on.
If the light still does not come on, check the electrical outlet for
power. Turn off your monitor and unplug it from the outlet.
Then plug a lamp into the wall outlet and turn it on. If the light
turns on, your monitor may be faulty.
Troubleshooting 6-5