SD Card problem

[Kyrill]

Hello World!

Im a newbee in 3d printing and finished the Printer yesterday. I build an geeetech prusa I3 pro B.
Now I test the functions. Today I slice a G-code and save it on a 1 GB SD-Card wich is formated with FAT.
I put it in the SD card slot of my "Card inserted" appears at bottom line at the display. I push the button. Next menu "No SD card". If I change to this point nothing happen. What ist wrong? My file is named .gcode.