Hey I just bought this Macbook pro 15" late 2011 model. I updated it with 16gb of ram and left the 500gb hd in there. Had some issues after wiping the hd by using the install dvd. Thinking that it was all good I installed my apps. Now after 10 min of use (everytime) the display glitches and shows me rows of pixels??? See attached. Also a loud, very loud, sound alerts me that im screwed and to force shutoff my computer everytime. Help?