Im using an optio s4 camera and just bought a 4GB SD card. But when I insert the SD card into the camera, there's only a black screen when I turn it on.:( But when I remove the SD card, the camera works perfectly well. Help me!

The Optio S4 works with MMC and SD cards. Your 4GB card is actually an SDHC card. While it fits into the slot, it is electronically incompatible. You need to go with cards 2GB and smaller.

Hi, have this camera and still use it, The camera only takes SD cards and Not SDHC, it will use SD cards up to 4 GB but the camera format the card DOWN to 1GB and will work OK, If you format the card back up to 4GB in Windows and put it in the camera and turn it on you you will see that you can take over 1000 pic's but it will fail to save you first picture saying format error, and formatting the card again in the camera again will but it back to 1GB again, I use 1GB 2GB and 4GB without any problems, and you can still get 4GB SD cards on the net. so it's realy on a 1GB card camera hope this helps.