It won’t start up, even when I press and hold the power button
[Re-Titled by Moderator]
Try an SMC reset.
Check your power adapter.
https://support.apple.com/en-us/HT203207
or
https://support.apple.com/en-us/HT204652
Take your laptop to Apple or an Apple Authorized Service Provider to be serviced.
Try an SMC reset.
Check your power adapter.
https://support.apple.com/en-us/HT203207
or
https://support.apple.com/en-us/HT204652
Take your laptop to Apple or an Apple Authorized Service Provider to be serviced.
If your Battery is dead you will not be able to start unless you are plugged into the mains.
Once you get it booted up, check your battery condition, holding the option key and click the battery icon in the upper right menu bar. Anything other then Condition: Normal needs to be serviced.
About Mac notebook batteries - Apple Support
https://support.apple.com/en-us/HT204054
Determine battery cycle count for Mac notebooks - Apple Support
https://support.apple.com/en-us/HT201585
Batteries - Maximizing Performance - Apple
https://www.apple.com/batteries/maximizing-performance/
My Macbook Pro won’t start up
