Acer Altos R920 Series - Manual (Page 163)

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• Try a different version of the software to see if the problem is with
the copy you are using.
• Make sure all cables are properly connected.
• If other software runs correctly on the system, contact your vendor
about the defective software.
No characters appear on the 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 Setup Utility?
• Remove all expansion cards and see if the system boots. If
successful, add the cards back in one at a time with a reboot
between each addition.
• Make sure the memory modules comply with the system
requirements.
• Make sure the memory modules have been populated according
to the system requirements.
• Remove and reseat the memory boards.
• Remove and reseat the memory modules.
• Make sure the processor complies with the system requirements.
• Make sure the processor is populated according to the system
requirements.
If you are using a video controller board, do the following:
1 Verify that the video works using the onboard video controller.