Hi, i am having a problem on my mac book pro 15" mid 2010 (i5 2.4Ghz 8gb ram , 500gb HD), when i am opening Photo Booth the program starts and open my cam , after 2-3 seconds my mac boots ! Also when i am trying to set the date and time the mac boots too. so i replaced my Hard drive to a brand new one , install fresh new OS X Yosemite and i still have the same problem !! Do you know what's wrong ?? I know its a hardware problem.....i hope not.