HELP computer screen flickering - laptop?

hey there...i have an asus g72gx, i bought it open box about a year ago. i paid 600 dollars. there's been a progressive and persistent problem though, as the screen flickers and sometimes blacks out completely. i have geek squad black tie protection, but they have been nothing but problems in the past. some days i'll go without having any problems with the flickering then others its terrible. something that does help is pressing and pinching on the screen. thanks for the advice!