Computer Problems! Hope to Fix it Myself!?

My lap top is acting fine, except for my screen. Sometimes it will turn "Snowy"(Like channel 3 on TVs used to be) and will scramble. I smack it lightly, or move the screen forward or back, and it stops. I know it might be a hook up issue. I trained for my A+ but I'm still very afraid to crack open my computer and root around for the answer. Hopefully you guys can help!