MacBook Pro M4 with black screen but powered on

How the problem presents

The more precise the description, the fewer unnecessary tests will be required:

Components to be ruled out

These are the areas that should be examined in this case:

The cause is confirmed by measurement and actual behaviour, not by similarity with another Mac.

What information speeds up diagnosis

Before sending the device, state the screen size, the approximate year, the capacity, the type of charger used and the exact moment the fault appeared. It is also helpful to explain whether there was liquid exposure, a fall, an update, a previous repair or progressive loss of battery life.

This information does not replace measurements, but allows us to prepare appropriate tests and avoid actions that may put the integrated storage at risk.