User manual

6 Troubleshooting
86
No characters appear on screen
Check the following:
• Is the keyboard functioning? Test it by turning the “Num Lock”
function on and off to make sure the Num Lock light is
functioning.
• Is the video monitor plugged in and turned on? If you are using a
switch box, is it switched to the correct system?
• Are the brightness and contrast controls on the video monitor
properly adjusted?
• Is the video monitor signal cable properly installed?
• Does this video monitor work correctly if plugged into a different
system?
• Is the onboard video controller enabled in the BIOS?
• Remove all add-in cards and see if the video returns. If successful,
add the cards back in one at a time with a reboot between each
addition.
• Make sure the memory DIMMs comply with the system
requirements.
• Make sure the memory DIMMs have been populated according to
the system requirements.
• Remove the memory DIMMs and re-seat them.
• Make sure the processor(s) comply with the system requirements.
• Make sure the processor(s) have been populated according to the
system requirements.
• Remove the processor(s) and re-seat them.
If you are using an add-in video controller board, do the following:
1 Verify that the video works using the onboard video controller.
2 Verify that the video controller board is fully seated in the server
board connector.
3 Reboot the system for changes to take effect.
4 If there are still no characters on the screen after you reboot the
system and POST emits a beep code, write down the beep code