Why My Laptop Shows Blue Screen In Many Occasions?

I want to know why my laptop always shown a blue screen while rotating or even moving my laptop’s screen. I have no idea how it was happening but I want to tell you that there is no full blue screen that appeared on my laptop. Certain zig-zag colors appeared whenever I touched my screen or even rotate it for eye-sight.

I think that there is a problem related to cable wire. I have no idea about it but someone said it so I said that, what do you think sir? what is the problem here and what are the ways which help me to get rid of this issue.

I am using HP Pavilion g-6 Laptop with 4GB RAM and have windows 8. Reply as soon as possible.

Thanks, Sir.