It was normal
until I accidentally hit my pc case while watching movie causing it to freeze (with a continuous buzzing noise)
It wont respond so I restarted it .by pressing the button at the pc .
After that all went well until I played a game ,
after a couple of minutes it starts to freeze randomly for a second with buzzing noises from the speakers .

can someone help me?
I want to return it back to normal but I don't know how.
I didn't hit it intentionally .
it was running fine, then my sister tries to do something stupid n I accidentally kicked the pc unit