My computer is making high pitched noises since today

[Jad.lemrini]

I think i'm being hacked. This is why:
Yesterday at night a computer started making rock music while i was sleeping. It then stopped after a few seconds. For some reason, now, my computer makes high pitched beep noises each minute (i think).

 

[2sidedpolygon]

How long do these beeps last, and is there any consistency to them?