Tried a couple of different SD cards, one of which has previously mounted successfully. I've also tried a couple of suggestions off the net which were to blow hard into the slot, and to try rebooting with the SD card in. I did read that running VM software can interfere (I have VirtualBox installed) but the solution in that case wasn't obvious.
Does anyone have other suggestions? If not what are my options here? Is this the sort of thing Apple can fix in a store?
Does anyone have other suggestions? If not what are my options here? Is this the sort of thing Apple can fix in a store?