Sometimes when I am playing online games, my whole computer will freeze and when sound is enabled, then it makes a very annoying buzzing sound (similar to the sound you hear in movies when a movie starts and it makes that buzz noise). Control+Alt+Delete won't work, Esc key won't work, nothing. I have to force shut down my laptop and then start it up again. How can I fix this?
LAPTOP specs
Toshiba Satelitte S50-A028 Notebook bought on October 5th 2013
OS: Win8.0 64-bit
CPU: Intel Core i5-3230M @2.6Ghz
GPU: Nvidia GeForce GT 740M 2Gb With Optimus + Intel HD 4600 Graphics
If anyone could help, that'd be great, thanks