Acer R910 Bootable CD drive is not detected., New memory modules installed are not detected. , External device connected to a USB connector does not work., Cannot connect to a server

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• If using SCSI drives, verify that each SCSI ID numbers is unique on
the SCSI bus. Refer to the drive documentation for details on
setting the SCSI ID for your drives.
• If using IDE drives, verify that the master/slave settings are set
correctly. Refer to the drive documentation for details on setting
the master/slave settings.
• If using RAID configuration with SSCSI drives, make sure the RAID
card is installed correctly.
Bootable CD drive is not detected.
Make sure the Boot settings in the BIOS setup utility is configured to
allow the CD drive to be the first bootable device.
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.