All-in-One Problem

None of that worked…still no recognition with any cards in any computer…not making sense. Bought a new card, formatted it, and voila…sudden recognition… It was as  tho the Sandisk(a new one) got programmed to not appear. Never seen anything quite like this. Also left the one laptop off for quite a while, as in, you know, “turn your computer off then back on.”. Too many variables…but very weird.