I was typing a comment in a Youtube video. All of the sudden I was not able to type any more. I was hitting the keys but nothing. They keyboard was irresponsive. I tried to switch application and nothing, track pad nothing. After 30 seconds in the text field an m started to show mmmmmmmmmmmmmmmmmmmmm I pushed th power button and I was able to restart the mac by keeping it pushed. No force quit application worked, nothing. I have a MBP 2015 with 16GB of ram and 10.10.3 Any ideas?