Ok since noone has helped since 02/23 I'm surfacing this old thread with a proper fix so people looking this up in the future get the right advice.
This same error plagues games like Deadspace 2 on some computers, mostly laptops with mobility cards I find. Anyways, Right-click on CS:GO in your games library > Properties > Launch options > Add this without brackets " -windowed".
For some reason when this games and Deadspace 2 for example try to load in fullscreen mode it freezes and sometimes you need to hard restart because the computer becomes unresponsive. I do not know why this is. Anyways windowed mode seems to fix it, once you have loaded it the first time you can remove that but I leave mine on and just go into the options and set it to fullscreen everytime I play which takes all of 5 seconds. I do this because my laptop still did crash after a sucessful load with that removed.