I looked this model on the web so it's years old.
Try bumping your canned air schedule to daily for a week, weekly for a month and then back to 1st of the month.
If that doesn't cure it, replace ALL heatsink compound under all heatsinks (under 10 bucks!)
My laptop is Dell Precision M4600 with graphics card nvidia Quadro 1000m.and CPU Core i7
I was watching a movie on the laptop and suddenly i noticed something wrong my screen got pixel termites fuzzy flickering pattern changing dead looking pixels every where.i restarted the laptop several times with no change then i noticed that when i start the laptop from cold state the problem appears and after 5 or 10 min i close the lid and open it again the problem disappears.i tried it 3 times till now.can anyone explaining what`s the problem?
thanks in advance.