how old is your macbook pro?
hold the power button on your macbook pro for 5 seconds
after that your mac will shutdown
power up again, press and hold alt+command+ R +P right away
keep holding it until you see your macbook pro restart couple of time
let me know if you hear a chimes sound?
after your mac power up, you should hear a chimes sound
if you didnt hear any sound, please let me know