Dell Inspiron 5423 :: Screen Distorted Almost On Every Boot Up

I have 5423 i3 and recently I started having a problem with which was that on almost every boot the screen would be distorted I.e vertical and horizontal lines would appear rainbow like distorted colours and although anything was barely visible I could make out that the screen ws divided into these four grids like appearance each acting like a separate unit by itself AND along with this the laptop would make 8 beeps on boot until window load screen would appear.

When this problem first started I solved it by holding the laptop screen at an angle then powering it on or sometimes pressing the power button and closing the lid and after I would hear win startup sound I would open it and it would work fine, but now since a day or two ive tried every method amd nothing works...