IBM X.25 - Manual (Page 33)

Blank Screen, Blinking Cursor, or Non-Decipherable
Data
If your screen is completely blank or has a blinking cursor or
non-decipherable data, do the following:
1. Set the Power switch on the system unit to Off.
2. If only one co-processor adapter is installed, repeat the
diagnostics for your personal computer system to verify that your
system is functioning correctly. If your system is functioning
correctly, stop the procedures and replace the co-processor
adapter that is installed.
Note: For instructions on removing (and replacing) a
co-processor adapter, see the “Removal and
Replacement Procedures” on page 4-17.
If more than one co-processor adapter is installed, remove all the
adapters; then continue with the following step.
3. Insert your copy of the IBM Realtime Interface Co-Processor:
Advanced Diagnostics into diskette drive A, if previously
removed.
4. Set the Power switch on the system unit to On.
The screen that appears should look similar to the screen on page
4-4.
DOES THE SCREEN LOOK SIMILAR TO THE ONE SHOWN ON
PAGE 4-4?
NO Repeat the diagnostics for your personal computer system to
verify that your system unit is functioning correctly. If your
system unit is functioning correctly, your
IBM Realtime
Interface Co-Processor: Advanced Diagnostics diskette may
be defective.
YES Press 0 (RUN DIAGNOSTIC ROUTINES); then press Enter
and continue to the next page.
A screen similar to the following may appear.
Problem Determination Procedures 4-5