IBM PCjr

If you stiUhave video page 7 on your screen, press the
Ins key. Several uniformly colored screens will scroll by
(gray shades on televisions and composite displays,
color on RGB displays); then the advanced-test menu
will appear.
DO YOU HAVE " * " UNDER THE DISPLAY
SYMBOL?
The system board is bad. Replace it.
Repeat advanced POST and the advanced
tests to ensure that the IBM PCjr is operating
correctly.
You have finished the display PIC. If you still
have an unsolved problem, you should seek
technical assistance.
3-500-20 Display