Usually the first thing you need to do with any SD card and Camera is to go into the settings of the your camera and Format the SD card. This has to be done for each memory card you use with that camera. i.e. a SD card formatted on a Panasonic HD camcorder won't work in your Jazz Camcorder. The formatting is different between the two camcorders. New SD cards don't come formatted.
SO try inserting the SD card into your Jazz Cam and rummage through the setting until you find your memory settings. From there find the Format Memory Card function, format the SD Card and you should be good to go.

Could be you have the older model of the camera that only supports 2Gb?