Epson 4000 - Manual (Page 43)

Resetting the Computer
Occasionally, you may want to clear the computer’s current
settings or its memory without turning it off. You can do this
by resetting the computer.
For example, if an error occurs and the computer does not
respond to your keyboard entries, you can reset it to reload
your operating system and try again. However, resetting erases
any data in memory that you have not saved; so reset only if
necessary.
Caution
Do not reset the computer to exit a program. Some programs
classify and store new data when you exit them. If you reset
the computer without properly exiting a program, you may
lose data.
When you reset the computer, the operating system must be
either on the hard disk or on a diskette in drive A; so if you do
not have a hard disk, insert the operating system diskette in
drive A. If you are using DOS, you can hold down Ctrl and Alt
and press Del.
You can also press the RESET button located on the front right
side of your computer. (See the illustration below.) The screen
displays nothing for a moment and then the computer reloads
the operating system.
Using Your Computer 3-3