Acer Altos R5250 - Manual (Page 112)

5 System troubleshooting 94
Peripheral device connected to a USB port does not work.
Do the following:
• Reduce the number of external devices connected to a USB hub.
• Refer to the documentation that came with the device.
There is problem with the software program.
Do the following:
• Verify that the software is properly configured for the system.
Refer to the software installation and operation documentation
for instructions on setting up and using the software.
• Try a different version of the software to see if the problem is with
the copy you are using. If the other version runs correctly on the
system, contact your vendor about the defective software.
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.