Fuji Finepix 50i won't switch off & has frozen.

There are a few things you can try. I had a fuji that would sometimes do this also. I found low power was one of the main issues. First try a new set of NiMH as alkalines just wont cut it specualy with these older cameras. Next check the memory card door. There is a little tiny switch on the memory door that will turn the unit off if the door is opend. Make sure the door is fully closed and maybe even hold it down tite while you try and use it.