IBM 3270 Hardware User's Manual page 137

Were you able to complete the preceding
steps with the correct responses?
Yes No
I
The system unit has a
problem. Report the
problem or have the
unit serviced to fix
the problem . •
Was your original POST symptom a blank screen?
No Yes
I
Is your screen blank now?
Yes No
I
The system unit has a
problem. Report the
problem or have the
unit serviced to fix
the problem . •
The problem is most likely the display. You should
confirm this by running this test again with a
display that you know is working. If the problem
does not occur with the other display, your origina:
display has a problem; report the problem or have
the display serviced to fix the problem. If the
problem persists, your system unit has a problem;
report the problem or have your system unit servicE
(If you do not have another working display, report
your display, or have it serviced.) •
I
5-22 Book 1 - 3270 PC Work Station User's Guide