I tried holding in the power button but an apple came up and then the computer went back off
How can I repair my macbook pro? It will not start up. When I hold in the power button the apple comes up and then disappears and powers back off.
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What is the exact model of your Mac? You can get this information by entering the system serial number here:
Check Your Service and Support Coverage - Apple Support
What version of macOS is being used?
Make sure to disconnect all external devices in case one of them is causing a problem.
Were there any issues before this power on issue occurred? Did you intentionally power off the laptop or did it power off on its own?
Until we get more information, this Apple article is the best I can suggest:
If your Mac doesn't start up all the way - Apple Support