Acer Altos R520 M2 Series User Manual page 147

System does not recognize all of the processors installed.
Do the following:
• Make sure the processor specifications comply with the system
requirements.
• Make sure the processor has been populated according to the
system guidelines.
• Make sure the processor is properly installed on their mainboard
slots.
No characters appear on the display monitor.
Check the following:
• Is the keyboard functioning? Test it by turning the Num Lock
function on and off to check if the Num Lock indicator lights up.
• Is the display 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 display monitor signal cable properly connected?
• Does this display monitor work correctly if plugged into a different
system?
• Remove all add-in cares and see if the system boots.
If reboot is successful, install the cards back in one at a time with a
reboot between each addition to determine if one of them is
causing the problem.
• Make sure that you have properly installed system compliant
memory modules, and that there populated according to the
system guidelines.
• Make sure that you have installed system compliant processors,
and that there populated according to the system guidelines.
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