Macbook Pro shuts down half way through startup.

I’m having same problem; any ideas? I’m a home bound senior without much knowledge of computers. Please help!

Reset the SMC and NVRAM:

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

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

Then try a safe boot:

https://support.apple.com/en-us/HT201262

Any change?

Ciao.

Hey there. Sorry to bother you, but I was reading through this thread and realized you had the exact same problem that I am having now. I did all the things that were recommended but nothing worked. I have an appointment set with apple, but not until next week. Did you ever find out what it was?

Hi. Try restarting your Mac in Safe mode:

- 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 Disc 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 Disc Permissions and then on Repair Disc Permissions

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

I Had Similer or the same problem... drove me nuts for weeks.. id switch the computer on, it comes up nicely and run for about five to ten minutes,, then, it shuts down.. i reboot several times after and it continues shutting dow.. sometimes it loads half way then shuts down... i keep on powering it on and of for about 20 minutes then i comes back on and stays on with no problems for the rest of the day... the next day same problem.. i tried everything i could find on the net .. nothing worked... the FIX... I have an app on the computer called CleanMyMac 3... this solved the problem for me. i ran the app and went to the uninstall ..removed some unessasary stuff (don't remember what they were) unused apps, junk files, microsft stuff.. computer runs smooth since .. no more start up issues for some weeks now... hope this helps. good luck.

I tryed the same restarting my computer over and over, never pass of half way when loading. Did you say you did this for about 20 minutes? Is there another way to get in the computer?
I can't reinstall Sierra OS either, I need help I don't know what to do, I don't want to lose my files.

Try the SMC reset again. If no success, then an appointment at an Apple store genius bar is your best option. The evaluation will be FREE.

Ciao.

I’ve been having this problem for the past week and do not have an Apple store near me. were you able to figure out the solution to start up your Mac? I would really appreciate any suggestions you have.

I'm having the same issue as well. Never had an issue. Restarted my Imac to get a software program rolling and ka-pow, 5 times in a row now it shuts off half way through the load process. Unbelievable. Tried this SMC reset deal, not sure how unplugging and replugging it in after 15-20 secs will help but I tried and to no prevail.

Hi! I have the same problem now.. were you able to fix your macbook?