Epson 4000 - Manual (Page 107)

Your computer sudden/y stops operating.
You may have overloaded the power supply limitations. See
your option card manual(s) for the power requirements for
your option card(s). Then check Appendix A to see if you have
exceeded the option slot power limits.
Keyboard Problems
The screen displays a keyboard error
message
when you
turn on of reset the computer.
Make sure the keyboard is securely connected to the correct
port.
Nothing happens when you type on
the
keyboard.
See “The Computer Does Not Respond,” above.
The cursor keys on the numeric
keypad
do not work
properly.
If the Num Lock light in the upper right corner of the keyboard
is lit, press NumLock to turn off the function.
Monitor Problems
There
is
no display on the
screen.
Check that the monitor’s power switch is on and that its power
light is on.
The power light is
on, but you
still
do not
see anything on
the
screen.
Check the brightness and contrast controls.
Troubleshooting
7-5