Card reader is not running :(


I uses Macbook pro mid 2012, mac os X version 10.8.3. But it's not running Card reader. I don't use it to read SD card 8Gb. (when i put it in, the mac os is not aware, didn't change).
What is it problem? How can i fix it ?
Help me!!!


I can haz cigar?
Have you tried rebooting the computer? Also, can you verify that the SD card works on another computer?