Whenever I try to play a video (youtube, movie online, etc), my computer screen goes black and restarts the OS. When I log back in, it is as if my computer restarted, however no BSOD appears for me to see what if any error message appears (not sure if that is my fault for changing something to keep a BSOD from displaying). I've tried to update the graphics card but it says up to date. I have a Lenovo Y40-70 running windows 8, have had a lot of problems with this computer in the past but not anything like this issue before. Any help would be greatly appreciated.