Acer Altos R920 Series User Manual page 164

146
2 Verify that the video controller board is fully seated in the
mainboard 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
you hear. This information is useful for your service representative.
5 If you do not receive a beep code and characters do not appear,
the video display monitor or video controller may have failed.
Contact your service representative or authorized dealer for help.
Characters are distorted or incorrect.
Check the following:
• Are the brightness and contrast controls properly adjusted on the
video monitor? Refer to the documentation that came with the
video monitor.
• Are the video monitor's signal and power cables properly
connected.
• Is the video monitor working correctly when plugged into a
different system?
System cooling fan do not rotate properly.
If the system cooling fan is not operating properly, it is an indication of
possible system component failure.
Check the following:
• Is the power indicator lit? If not, see "Power indicator does not
light." on page 140 .
• Is the hot-swap fan module LED lit?
• Are any other control panel LEDs lit?
• Have any of the fan motors stopped? Use the server management
subsystem to check the fan status.
• Have your fans speeded up in response to an overheating
situation?
• Have your fans speeded up in response to a fan that has failed?
5 System troubleshooting