I recently bought a Lenovo Y 580. Whenever I play any game even on the lowest settings the game either has visual artifacts and/or crashes. I have sent the computer into Lenovo twice, the first time they replaced the HDD and the second time they said nothing was wrong, but clearly something is wrong. My specs are: CPU: Intel core i7, 750 GB, Geforce GTX 660M, with windows 8. Any help would be appreciated, thank you.