IBM 3270 Maintenance Manual page 100

Your display may function properly except for
the cursor, which may be missing or out of its
normal position. Check your screen for the
cursor.
The IBM 3270 Personal Computer
DIAGNOSTICS
Version X.XX (C) Copyright IBM Corp XXXX, XXX X
SELECT AN OPTION
0- RUN DIAGNOSTIC ROUTINES
2 - FORMAT DISKETTE
3 - PREPARE SYSTEM FOR RELOCATION
9 - EXIT TO SYSTEM DISKETTE
ENTER THE ACTION DESIRED
IS THE CURSOR IN THE CORRECT
LOCATION ON THE SCREEN?
NO
Replace the display adapter. See Section
5, "Removal/Replacement and
Adjustments."
YES
October 1984 3-90-3