Starting up only gives me a partial boing, does not start up.
Starting my MacBook Pro only produces a partial boing, which is repeated after a few seconds over and over again. Meanwhile nothing appears on the screen, it stays black.
It's no different whether I try to start from battery power of from AC power.
Connecting the power adapter gives me, at first a green light, which turns to orange after a few seconds.
What might cause this problem? It was working fine until a few days ago and then suddenly this situation appeared !
Thanks for any suggestions and kind regards.