Fix 1: Check the power status of your MacBook Pro Although these fixes are for MacBook Pro, some of them also work for the MacBook Air or iMac won’t turn on issue. This is the first thing you should do when your MacBook Pro is not turning on. Make sure your MacBook Pro has enough power. Don't disturb your Mac while the ROM recovery takes place.

Newer computers automatically recover from a corrupted ROM when this occurs, a progress bar appears on the screen during ROM recovery mode. If you were using your laptop on battery power, just plug the power cable into your notebook. Three long tones, three short tones, three long tones: EFI ROM corruption is detected, and your Mac is in EFI ROM recovery mode. Then wait for a couple of minutes, and try turning it on.

If your laptop has been plugged in, then make sure your power cable and adapter are not broken.

If this didn’t work for you, move on to Fix 2, below… Fix 2: Press the power button for 10 seconds And replace your cable or adapter with the new ones if you’re experiencing any problem with them. This is an effective fix for your MacBook Pro not working issue. But if not, you may need to… Fix 3: Reset the SMC To do this:ġ) Remove the power cable from your MacBook ProĢ) Press and hold the power button for 10 seconds, then (don’t release the button!) plug the power cable back into your MacBook Pro.ģ) Release the power button when you see your MacBook Pro start up.

Macbook pro 3 beeps when turning on