MacBook screen stays black

No MacBook will run a Classic operating system.

Please use this article to more accurately describe which Mac you are running:

https://discussions.apple.com/docs/DOC-6413

And pick the correct forum to post in.

Usually this means the signal is not getting to the display.

Sometimes this happens because the machine was last set to work with an external display only. If it ever happens that way, try starting the machine up with the external display and see if you can adjust Apple menu -> System Preferences -> Displays.

If not, reset the SMC or PRAM (if under 4 years old is possible with the PRAM).

Mac startup key combinations - Apple Support (GU)