i appreciate waltonosex that he has described each aspect of your question in very beautiful manner.
1. Turn on the ICN510 & remove the SD card
2. Switch off the unit from the back (OFF/ON).
3. Then switch it on from the back (ON/OFF)
4. Allow the ICN to bootup (start up).
5. Insert the SD card. It should work.
i think i joined the forum due to this 