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Message: <blockquote data-quote="pm-r" data-source="post: 1808586" data-attributes="member: 175845">I'd start by disconnecting all devices you don't need, then shutdown, wait at least 30 - 40 seconds, then Boot up.Press and hold the option key and select the Apple icon at the top left and select "System Information", then select USB in the left column and see what it shows. Close the window.Now connect your new device and repeat procedure and see if the devices shown.You've already done the other diagnostics that would normally have been suggested, but it seems to be a bit of an odd situation.The above procedure may not fix the problem, but it should at least show if the device is being recognized or not when connected.- Patrick======</blockquote>