I have a vaio laptop intel core i5-250M Processor 2.40 GHz with Turbo Boost up to 2.93 GHz. So this happen quite a long time ago, it all started when I play a game called dota 2. After quite sometime in the middle of the game or when playing it, there is these lines in some colours and huge pixels all over my screen. On what i notice, it gets more bad the longer it is. It is really annoying when playing. After reading some other people problems, it is quite similar but my laptop did not froze so i can still play the game but it is really annoying. I need to restart my laptop everytime in order for the lines to dissapear. I have tried running furmark which stresses the graphics card and logs the temperature. However, it doesn't work. Help please