Epson 500 Series - Manual (Page 24)

Before you turn on the computer, first connect and turn on any
external devices you will be using--such as a printer or monitor.
(See Chapter 4 for information about installing optional devices.)
Then press the power button on the top of the computer to turn it
on..
The Computer performs a series of power-on on diagnostics tests to
check the circuit boards, memory, ports,. keyboard, and disk
drives. It displays several messages during the diagnostics,
including this prompt:
Press
< D e l e t e >
If
you
w a n t
to run setup
If the tests indicate a problem with the system or a change in
configuration, you will see an error message followed by this
Prompt:
RUN SETUP UTILLITY
Press
<F1> to RBSONE
If this happens, press F1 to run the Setup program and check your
system configuration. See Chapter 5 for instructions.
Setting Up the Computer 1-9