Some firmware corrupted. Try turning the phone off, inserting the card, then turning it on.
If that doesn't work, and it's extremely rare, the SD port is bad in some strange way. (Usually - and, as I said, even usually is a rare occurrence - the card reads or it doesn't or there's a file on it that causes a problem when Media Scan scans the card - but then the phone appears to hang.) When the port goes bad, it just looks like there's no card, which is why the "some strange way".
10-19-2018 03:13 PM