No Picture with my BPi


I have a Problem. I got a case and before I touched my Banana Pi I just made sure that I have no electric charge (Sorry I am not a native english Speaker). Now I used to put Image on SD card. Tried it. but No Picture. I tried another SD (both 32 GB). No Picture. I tried another Image no. Picture. The Only thing I saw is that sometimes my TV says Signal found, No Signal, Signal Found, etc. And a Red Diod is shining on Board.

No Picture without SD Card.