Epson EL 486UC - Manual (Page 110)

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
Yourmouse isn’t working properly or you see an auxiliary
device error message.
Make sure the mouse cable is securely connected to the mouse
port and not the keyboard port. Also make sure you installed
the mouse driver correctly (if necessary). See the manual that
came with your mouse for instructions. (Windows
automatically installs a mouse driver.)
Controller Problems
You see a controller error for the drive controller or the I/O
port controllers when you start your system.
The indicated controller on your system board may be faulty.
If you have an option card with a controller that will work with
your device, you can install it and change the jumper settings
on the system board to disable the built-in controller. You can
then continue to use your system until it is convenient for you
to have it serviced.
6-12 Troubleshooting