Macbook Pro purple lines on screen?

I have a 2012 Macbook Pro. When I push on the bottom casing my screen gets purple lines in it, the Macbook freezes. When I try to reboot it I get the 3 beeps, which I know is a memory issue. I've tried replacing the memory, and the lower casing. I have a feeling its the board. I really hope its not. I cant attach the picture of what its doing. If you have any indea of what it could or if youve had this problem please help me.

If anyone wants to see the pictures of what the screen is doing and where I am touching I will send them.

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