piercing high pitch extremely loud noise intolerable

we all are familiar with that nose but eventually our brain tunes it out. well this one is so extreme i can’t stand it. i’m thinking the person who i bought this from probably couldn’t hear it as he looks middle aged. please tell me i can mitigate this without opening it up as i don’t feel comfortable doing so. pls tell me there is a way. i can still hear it even tho it’s off.