![]() ![]() If these suggestions don’t work, see the documentation that came with the device for troubleshooting tips, or contact the manufacturer for help. Restart your Mac: Choose Apple menu > Restart. Reopen apps: Quit and reopen any apps that use the device. If the device appears but does not work, review the device’s documentation for further troubleshooting steps. In the window that appears, see if the Thunderbolt device is listed below Hardware in the list on the left. Verify that the device appears in System Information: On your Mac, press and hold the Option key, then choose Apple menu > System Information. ![]() If a Mini DisplayPort device is part of the chain, make sure it’s at the end and is connected with a Mini DisplayPort cable. (If the device connected directly to your Mac requires a power cord, it should have one, too.) Then make sure that all the devices other than the one connected directly to your Mac have power cords. Check the manufacturer’s website for the latest software.Ĭheck chained devices: If the device is in a chain of connected Thunderbolt devices, each connected to another with only one connected directly to the Thunderbolt port, disconnect the device from the chain and verify that it works (see “Check the device,” above). See the Apple Support article Identify the ports on your Mac.Ĭheck for missing software: Make sure you installed any software that came with the device. A Thunderbolt cable has a Thunderbolt icon on the connector.Ĭheck that you’re using the right port: Make sure you connect the Thunderbolt cable to a Thunderbolt port, not a USB-C port. If the device is in a chain of devices, remove the device from the chain, then plug it directly into your computer and verify that it works.Ĭheck that you’re using the right cable: Make sure you connect the Thunderbolt device with a Thunderbolt cable, not a Mini DisplayPort cable. If the device requires a power cord, make sure it’s plugged in.
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