MPC won’t shut down!

Whenever I go to power down my MPC it just immediately turns right back on. Does anyone have any suggestions? I downgraded to 2.14 my power source is correct. It’s got nothing to do with that. I think it might have something to do with the actual power button maybe. And the repair shop by me is $180 just to walk through the door, and a 5 week wait, which is crazy. Any suggestions?