Blue screen while working

Hello everyone, yesterday i had 3 times cpu panik so i decided to make a clean install of the OSX on my computer. While i was watching a video on youtube (after the clean install) the computer displayed a blue screen (see images) and in order to remove it i have force the computer to reboot. Does any one know whats the problem?

I want also to mention that the summer i have changed the logic board twice for the same problem.

My previus post : https://discussions.apple.com/thread/5618394