What is wrong with my Galaxy Grand Prime???

This is going to sound REALLY strange. My phone works GREAT as long as I keep the back off of it. If I try and put the back on the screen goes black and I cant use it. I can see backlighting but the screen is black. Also if I try to touch the screen it goes all weird and shows lines or weird spectrum but nothing on the screen. Then I take the back off and hit the power button and it is back to normal.....WTH Is going on with it!!!

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