Laptop only shows black image?

Yesterday my laptop (6 months old) just hung up and played my music on youtube in a loop and no longer responded. And now he doesn't want to start properly anymore. It can be switched on, the fan turned, the screen shows a black image and the logo is displayed briefly, but windows does not appear.

does someone have tips for me what I can do?

First test with a Linux CD or stick whether it works… Then save the data (via Linux) and then reinstall everything.

Unfortunately I don't have a Linux CD or stick available. But I just discovered when I press ctrl + alt + delete that the screen switches off completely for about 3 seconds…