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Bizarre USB problem with new Mac Mini


Distinguished Member
I have just picked up a refurb Mac Mini and am using it with a Logitech K400 USB keyboard. It all works fine, until I connect an external HDD.

At that point the keyboard stops working, but it is fine again when I remove the HDD! I have tried varying the USB ports I am using for each, but it doesn't seem to be able to support both at once.

I don't really want to send it back to Apple if it is a 'feature' rather than a fault, but I have never seen anything like this before.


Previously MacGeekPaul
daveb975 it’s definitely not a feature, all USB ports should work together fully loaded with devices, it could be a problem, but most my guess would be to reset the SMC and/or PMU, follow the instructions in the links, this *should* fix it, don’t forget you have 90days phone support even with refurbs if your nearest Apple store is not too local.

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