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

Question

Hi Folks,I just got a Fuji Finepix 50i second hand. It was dead to start with so I charged it and set the date & time. It then froze. Nothing would work. The screen was off, the green light was on and all the buttons do nothing now. I have removed the battery. I replaced the battery. I replaced the memory card and it still won't power off or work.I have seen on the Internet that other folk have had this problem but don't say how they fixed it.Please help.