Yosemite with Samsung SSD

Please help me.. I have a late 2008 macbook that is replaced to Samsung EVO SSD. I installed Yosemite 10.10.4 on this labtop. Installation was just fine and everything was just fine before I turned off the computer. When I rebooted the computer, the progress bar was stuck on the 50%. I googled it and reseted the NVRAM I didn't work. Also when I booted to the recovery mode and checked the Disc Utility, the format of my driver was changed from Mac OS extended (journaled) to Mac OS Extended. It cuased I couldn't do anything with my driver (mount or repair). Is this normal? or my SSD is damaged? If I downgraded it from Yosemite to Maverick, wouldn't this happen? Or I shouldn't use the SSD for my macbook. I am really upset with this problem.

Any recommand would be helpful for me. Thanks.