HP Slate 21 4.4.2 update problems it wont turn on only white and black dots

when i boot it up sometimes theres only snow in the screen like if the tv has no tv signal or just randomly colors theres no bass at all and when i use mouse or touch theres alot interface lag can anyone help me heres a picture of how my boot often looks like and nothing else happens other then random pictures in different colors and this only happened after kitkat update

anyone got any ideas? i really need help with these problems most of all the fact that it wont boot and it has interface lag i really love this all in one tablet i really want it fixed

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