My screen has this really weird glitch when I touch the mouse pad
Please excuse me as my knowledge on computers is very limited.
I just bought a Dell Inspiron second hand. The person who sold it to me has no knowledge or doesn't want to tell me what's wrong with it. A few minutes after you power it on and start using the touchpad it will sometimes glitch. The screen will go grey and there will be lines. If I stop using the touchpad for a few minutes it will go away. But it continues to do it randomly every few minutes.
I would really like to know what is wrong with it and how I fix it. I know that it has been dropped as there is a chip in the corner under the keypad.