IBM IntelliStation Z Pro 6223 Hardware Maintenance Manual And Troubleshooting Manual page 109

Note: See Chapter 7, "Parts listing Types 6223 and 6227," on page 115 to determine which components are
replaceable by the customer (CRU), and which components must be replaced by a field service technician (FRU).
Symptom
The screen is blank.
Only the cursor appears.
The monitor works when you
turn on the computer but goes
blank when you start some
application programs.
Monitor
FRU/action
1. Verify that:
v The computer power cord is connected to the computer and a working
electrical outlet.
v The monitor cables are connected properly.
v The monitor is turned on and the brightness and contrast controls are
adjusted correctly.
v If the computers are C2T chained together, verify that:
– The C2T chain cables are securely connected to the computers.
– The C2T breakout cable is connected properly.
– A computer that is turned on is selected.
Important: In some memory configurations, the 3-3-3 beep code might sound
during POST followed by a blank display screen. If this occurs and the Boot
Fail Count feature in the Start Options of the Configuration/Setup Utility
program is set to Enabled (its default setting), you must restart the computer
three times to force the system BIOS to reset the CMOS values to the default
configuration (memory connector or bank of connectors enabled).
If you have installed a Remote Supervisor Adapter II in the computer, make
sure that the video cable is connected to the Remote Supervisor Adapter II.
2. Make sure that damaged BIOS code is not affecting the video; see "Recovering
from a POST/BIOS update failure" on page 19.
3. If you have verified these items and the screen remains blank, replace:
a. Monitor
b. Video adapter, if installed
c. System board
v See "Undetermined problems" on page 113.
1. Verify that:
v The application program is not setting a display mode higher than the
capability of the monitor.
v The primary monitor cable is connected to the C2T device breakout cable.
v You installed the necessary device drivers for the applications.
2. If you have verified these items and the screen remains blank, replace the
monitor.
Chapter 6. Symptom-to-FRU index
99