Acer Altos R720 Series User Manual page 150

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If you have installed one or more hard drives in the system, do the
following:
• Make sure the power and signal cables are connected correctly.
• If using a sixth HDD, make sure the sixth HDD board is properly
installed to the backplane board and HDD is plugged into
connectors on the sixth HDD board. Check that the relevant
switches and jumpers on the hard drive are set correctly. Refer to
drive documentation for more information.
ODD (optical disk drive) activity indicator does not light.
Do the following:
• Make sure the ODD and interposer board are properly connected.
• Check that relevant switches and jumpers on the drive are set
correctly.
• Check that drive is properly configured.
• Check that onboard IDE controller is enabled in the BIOS setup.
ODD tray cannot be ejected.
• Insert the tip of a paperclip into the small hole on the ODD drive.
Slowly pull the tray out from the drive until the tray is fully
extended then remove the disc.
ODD 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 unscratched.
• Make sure ODD and interposer board are properly connected.
5 Troubleshooting