IBM Personal Computer XT Manual To Operations page 185

10
Set the display's Power control to Off.
11
Disconnect the display's signal cable from the
system unit (or expansion unit).
9-pin Signal Connector
on Color/Graphics
Monitor Adapter
12
Set the display's Power control to On.
13
Is the screen white?
YES -
Have the unit to which the display was
attached serviced.
NO - Have the display serviced.
14
Watch the screen and set the Power switch on
the expansion unit (if attached) to On. Then set
the system unit's Power switch to On.
April 1984 Test 9000-5