Are you using window8?
2. Please check if there is other file in CF card? If yes, please delete. It should be empty.
3. Please also do try CF card format.
4. You said it was not working at PC. What about video output? When you put CF card in main unit and connect to monitor by video output, please check if this is working or not.
5. If this is working in video output, it mean that is other file in CF card. Then, it is not working in PC.