Epson 4000 - Manual (Page 114)

An external device connected to the option curd is not
working correctly.
Make sure you are using the proper cable to connect the device
to the card.
Memory Module Problems
The memory count displayed by the power-on diagnostics
program
is incorrect.
You may have installed the SIMMs incorrectly. They may be
the wrong type or speed, or they may not be inserted all the
way. See Chapter 4 for information on installing SIMMs.
If you have installed a gold-plated SIMM in one of the sockets,
the socket may have corroded slightly. Remove the SIMM and
clean the gold-plated connection; then reinstall the SIMM.
Mouse Problems
Your mouse isn’t working properly or you see an auxiliary
device error message.
Make sure the mouse cable is securely connected to the MOUSE
port. Also make sure you installed the mouse driver correctly
(if necessary). See the documentation that came with your
mouse for instructions. (You don’t need to install a mouse
driver for Windows 3.1.)
7-12 Troubleshooting