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C. Troubleshooting Guide
Computer does not see 3d device
If you attach a 3d device to your computer, and the computer is unable to communicate with the 3d device
hardware there are five basic possibilities for the source of the problem:
1. The 3d device is not powered up
2. If connected with USB, the USB cable is not connected or bad
3. If connected with Ethernet, the Ethernet Adapter (NIC) is not Gigabit capable
4. If connected with Ethernet, the Ethernet cable is not connected or bad
5. If connected with Ethernet, the MHLinkDriver is not installed properly, or is being blocked by the
operating system
6. The connection hardware has been damaged
3d device is not powered up
The first thing to check is that the 3d device is, in fact, powered up.
If the 3d device is powered up and booted properly, the Power, Sample Rate, and Locked front panel
indicators will be illuminated. If these indicators are not illuminated, the 3d device is not powered properly
or the unit’s firmware has been corrupted. If you determine that you are powering 3d device properly and
the indicators are not illuminated, you will need to contact Metric Halo support.
If the 3d device is properly powered, then check the next possibility.
Software is not installed properly
When connected to the computer via Ethernet, in order for the computer to properly communicate with
the 3d device the driver software needs to be installed correctly. If the driver is not installed correctly the
computer will fail to connect or discover the 3d device. If the MHLinkDriver.kext is not properly installed
in the /Library/Extensions folder of your computer, and is not properly authorized to load by the user, you
will not be able to use your 3d device for audio and you will not be able to control the device.
• The symptom of this is that the Front Panel FireWire/Computer indicator is not illuminated, and
the Mobile I/O does not appear as a Sound Output device in the Sound panel of the “System
Preferences” application, it does not appear in the Apple Audio/MIDI Setup Application, and it does
not appear in MIOConsole3d.
• To correct this condition, make sure the MHLinkDriver.kext file is installed correctly, and reboot and
then reconnect the 3d device to the computer. You must ensure that you have granted permission
for the driver to load if you are running on High Sierra macOS 10.13 or newer (see our FAQ for more
Driver Installation on High Sierra
). If you have verified that the software is installed properly,
check the next possibility.
• Another common problem was introduced with macOS Mojave (10.14.x) and Catalina (10.15.x). It
involves yet another security measure, where you must grant permission for the MIOConsole3d
application to access the “Microphone”. Without this permission, everything appears to be set up
and working properly but Core Audio passes digital zeroes instead of actual audio.