Delta WASP 2040 clay, cannot find SD card


Hi, My WASP suddenly cannot find the SD card eventhough I have inserted it. I have tried to turn the WASP off and start it upp again, with and without the SD card inserted. I have pulled ou the cord and waited for 10 seconds before putting it in and starting again. I have checked the SD card in my computers, there is nothing wrong with it. I have used this SD card in the WASP without any problems before. Help is needed!!!