I'm currently using linux mint (have used various distros for years and this problem has only cropped up recently despite reinstalling OS) on my laptop but I always have it closed and connected to an external display. It is connected via VGA.
Randomly the screen disconnects. If I'm listening to music or a video it still plays but I cant see anything (display just shows "no signal") Also hitting space bar or clicking or doing anything doesn't seem to have any result. I cant manage to pause playing music or video. Basically the computer is on and playing but unresponsive and the screen is not connected. When this happens I just have to do a hard reboot. Its also completely random from what I can tell. I thought it was do to an issue with external screen resolution I was having but I did a fresh install of the OS and it still happens. Then I thought It might be a heating issue... but I got a temp monitor and the temp is fine. Also when its a temp issue it usually foes all the way off.
Weirdly I can make it happen almost at command by going to the google chrome download page. Also its happened a few times right as I click youtube videos. Sometimes the computer works for several hours without an issue.
Edit. I took the monitor out of the equation and unplugged the vga. The laptop screen does the same thing. Seems like I can reproduce error when trying to play YouTube videos it's clearly some hardware issue.
Edited by brisingr, 21 October 2014 - 06:12 PM.