If it wasn't connecting, then it should give you a message stating that. Unfortunately, if you can't read it on the phone, it won't be readable anywhere else. The reason being that if you changed the SD card from "External" storage to "Internal" storage, which is what would be needed to actually run apps from the card, then it has encrypted the card so that it will only work on that one device. And, were you to say do any type of reset to the device, it, again, won't be able to read the data on the card. Just restarting a phone should not cause that, unless the card was taken out and put in another device.