Acer Altos R5250 - Manual (Page 111)

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DVD tray cannot be ejected.
Insert the tip of a paperclip into the small hole on the DVD drive.
Slowly pull the tray out from the drive until the tray is fully extended.
DVD drive cannot read a disc.
Do the following:
• Make sure you are using the correct type of disc.
• Make sure the disc is properly seated in the drive.
• Make sure the disc is unscratch and free of any contaminant.
• Make sure the drive’s IDE and power cables are properly
connected.
Newly installed memory modules are not detected.
Do the following:
• Make sure the memory modules specifications comply with the
system requirements.
• Make sure the memory modules have been populated according
to the system guidelines.
• Make sure the memory modules are properly installed on their
mainboard slots.
Network connection indicators do not light.
Do the following:
• Check the cabling and network equipment to make sure that they
are in proper condition.
• Reinstall the network drivers.
• Try another port or hub on the switch.
Network activity indicators do not light.
Do the following:
• Make sure the correct network drivers are loaded on the system.
• Network might be idle.