If you have access to the developer tools and want to poke around at a lower-level than usual, there's a USB Prober tool that's part of the Xcode hardware tools package. On no evidence, I'd also try a safe boot, try the USB Card Reader, and then shut down see if the behavior with this device changes,Īlso try the SMC reset, as that can reset the state of the device.Īlso see if other USB devices work and see if other USB ports work, as it's conceivable you've lost the USB port(s) on the iMac. One of those could conceivably be getting tangled with or confused by these USB devices. If you have any add-on tools that chat to devices on the USB, such as USB serial dongles, see if that software is current, and also look at removing it. Card Readers SD Memory Card Reader - USB-A USB-C Card Reader and Hub for SD and microSD SanDisk ImageMate PRO USB Type-C Multi-Card Reader/Writer Lexar. USB devices can fail, or can draw too much power, and one wonky device can drag down the whole USB bus. Mobile Edge 12-in-1 USB 2.0 Card Reader/Writer with 3-Port USB Hub. ![]() ![]() ![]() Shot-gun answer follows, and all this presuming that you've verified the sidebar stuff discussed earlier.ĭisconnect all external devices - hubs, disks, whatever - except the card reader, and try hot-plugging it again.
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