I have inserted and reinserted and reinserted my SD card into my laptop. But it still isn't working. I have tried all the normal tricks. Blowing on it etc. I think it may have broken...is this possible? How much will it cost to fix it?
When you insert your SD Card, see if you can see it in Disk Utility. If you can see it there, then format/erase that SD Card in MAC OS Extended Journaled if you're not using it for anything else or use FAT or exFat if you'll be using it with Windows. FAT if you're using it for your Digital Camera.