I have a Vivitek digital camera model # LDC-618Z3. It turns on when no memory card is inserted. When I put in a memory card, (Lexar 16 GB SDHC) the camera doesn"t go on. I noticed the camera and the batteries got worm when I left the card in after a while. Seems the bateries drained. Why wont the camera go on with the card installed? Is this memory card compatible? What is the largest amount of memory this camera can use? I am stumped. Hope you can help me.