(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). A Thunderbolt cable has a Thunderbolt icon on the connector.Ĭheck for missing software: Make sure you installed any software that came with the device. 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. Check the device: Make sure the device is turned on and its cables are connected.
