IBM Personal Computer AT Manual To Operations page 389

11
Disconnect the display's signal cable from the
display adapter.
IBM Color Display
System Unit
Rear View
12
Turn your display's power on.
13
Is the screen white?
YES Have your system unit serviced. Be sure
your Key Lock key is with your system
unit.
NO Have your display serviced. Be sure the
power cable is with your display.
Test 9000-7