Q: My Macbook pro turned itself off and now wont start again!

Try these steps:

Restart your Mac with the Shift button pressed.

- Shut down your Mac

- Wait until your computer turns off and after that press the Power button

- Right after you hear the startup tone, press and hold the Shift key

- Release the Shift key when you see a grey Apple sign and the progress bar below this sign

- Once you see Desktop, start a Disk Utility scan to detect and repair file system errors (don't forget to choose your main hard drive)

- Click on Verify Disc and then, if asked to fix problems, on Repair Disk

- After this, click on Verify Disk Permissions and then on Repair Disk Permissions

- After the process is finished, shut down your Mac and turn it back on after about 30 seconds

Apart from that, take a look at this Apple article and follow the instructions on Resetting NVRAM shown there: How to Reset NVRAM on your Mac - Apple Support

Take a look at the steps suggested by Apple in this article:

https://support.apple.com/en-us/HT204267

Hope this helps

This is the Mac Pro desktop forum. I requested your post be moved to the MacBook Pro laptop forum.

Reset the SMC and the NVRAM:

https://support.apple.com/en-us/HT201295

https://support.apple.com/en-us/HT204063

Try it more than once if you have to.

If no success, make an appointment at an apple store genius bar for a FREE evaluation.

Ciao.