I have a Nikon L-18 coolpix point and shoot digital camera ...I bought an SD card for it a generic one 128mb labelled "IMPACT" ...When I put the memory card in the L-18 camera NOTHING HAPPENS ? ...I put the memory card into my older minolta Dimage Z-3 and it works fine ...The L-18 Nikon camera works fine on the internal memory ... I looked in the operating manual and see Nikon lists Sandisk,Panasonic and Toshiba as "approved" memory cards ... Aren't the SD cards all the same THANK YOU IN ADVANCE ! Bob