IBM 5150 Hardware Maintenance Manual page 55

Position the System Unit Power switch to Off, reconnect the
Display and power On. Be sure your Contrast and Brightness
controls are turned up, clockwise.
(Note: If the Message on your display is too far to the left or
right to read the entire message, press
§
to move the
message to the right or
§
to move to the left.)
The IBM Personal Computer DIAGNOSTICS
Version 1.00 (C) Copyright IBM Corp 1981
SELECT AN OPTION
0- RUN DIAGNOSTIC ROUTINES
1 - FORMAT DISKETTE
2 - COPY DISKETTE
9 - EXIT TO SYSTEM DISKETTE
INSERT DIAGNOSTIC DISKETTE IN DRIVE
A AND ENTER THE ACTION OESIRED
,I,
l~t'~ ~
,;"""",,.,
""1"'"
WAS THE ABOVE MESSAGE STABLE AND READABLE
ON YOUR DISPLAY?
NO
Go to page 400-14.
YES
400-2