Chosen Solution
ive had this tablet for about 2 years and lately its been acting funny. At first it started turning off and on randomly then when i would be typing it would type random letters. Then just today its screen turned black and it started to vibrate intensely, later on it calmed down, but its still vibrating.
May be your display is not working. Try a hard reset to solve this issues. Hold the power and home button for 10 seconds. If not then you need to replace your screen.
