Epson 386SX - Manual (Page 37)

The power indicator on the front panel lights up. After a few
seconds, the computer starts to perform an internal self test.
This is a series of checks the computer completes each time you
turn it on to make sure everything is working correctly. If
anything is wrong, an error message appears on the screen.
You see a message prompting you to insert a system diskette.
(Do not insert a diskette at this point.)
If you cannot see the screen display clearly, use the controls on
your monitor to adjust the brightness and contrast until
characters on the screen are clear and bright. If the display is
not stable, check your monitor’s horizontal and vertical hold
controls.
After you adjust the monitor’s brightness and contrast, press the
power button again to turn off the computer. Then turn off the
monitor and any peripherals.
Now go on to Chapter 2 and follow the instructions there to
run the Setup program. After you run Setup, you need to install
MS-DOS using the instructions in your MS-DOS Installation
Guide.
Setting Up Your System 1-17