Acer Altos R920 Series - Manual (Page 161)

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New memory modules installed are not detected.
Do the following:
• Make sure the memory modules are properly seated on the
memory board’s DIMM slots.
• Make sure the memory modules comply with the system
requirements.
• Make sure the memory modules have been populated according
to the system requirements.
External device connected to a USB connector 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.
Cannot connect to a server.
• Make sure the network cable is securely attached to the correct
connector at the system rear panel.
• Try a different network cable.
• Make sure you are using the correct and the current drivers.
• Make sure the driver is loaded and the protocols are bound.
Problems with the network
Network status indicator does not light.
Do the following:
• Check the cabling and network equipment to make sure that all
cables are properly connected.
• Reinstall the network drivers.
• Try another port or hub on the switch.