Other Considerations for USB Not Working on a Mac And yes, this can apply to any and all Macs, whether a MacBook Pro, MacBook Air, MacBook, iMac, Mac Mini, or Mac Pro. If multiple USB devices are not working on a particular port, or all ports, then it’s obviously less likely to be a device issue, and more likely to be related to the Mac itself. The easiest way to determine if the USB device itself is the problem versus the Mac USB port, is to try and use at least two different USB devices and switch their ports. This is particularly true with cheap low quality USB devices and cables. If after all this we can look at running in depth hardware diagnostics.įirst and foremost, keep in mind that sometimes a USB device itself can fail, which may have nothing to do with the Mac itself. I’d start over, go through all of this to see if you can reset. I’m wondering if the keyboard problems have prevented complete resets. This will tell you if it is a software issue.

Next start up in Safe Mode by holding down the Shift key on start up. Now you can independently test both the keyboard and mouse. Start with disconnecting the mouse and plug it straight into a USB port.