I successfully broke her of the habit of chewing on stereo & power cables by lemon-facing her. I got super mad, yelled at her, squeezed fresh lemon juice onto her face and then swiped all the cables with the rest of the lemon. She spent about an hour or two cleaning herself up and never bit on another cable again.

Although she would sometimes creep back behind the stereo just to fuck with me because she knew she wasn't supposed to go back there. I'd yell at her and she'd run off making crazy meows. It's in a cat's nature to be mischievous and play games.