Hey Guys. i got a macbook pro 13 retina that i have hooked up over hdmi to a samsung screen , 27 inches nothing special. My laptop never experienced any sort of crashes up until i started to use the external screen , I've used yosemite for like 3 months before i attached the external screen. It all started with random logoffs , followed with application crashes (Chrome and skype) and now from time to time i can't log in after the screen saver kicks in .. when i unplug the HDMI cable all returns to normal. I know I'm not providing any logs of anything etc etc .. but just wondering if somebody it's experiencing the same problem. I'm about to do a clean yosemite install as the last time i did an upgrade from the previous OSX version. Any ideas?