I tried to disable screen blanking by adding
to the end of the line inconsoleblank=0
Since then the Raspberry doesn't seem to boot completely. I can see in the screen that the boot process is starting but then the screen turns off and nothing else happens./boot/cmdline.txt.
Now I don't even now how to undo my changes as I cannot get access to the raspberry.
Any help is highly appreciated. I'm a beginner and I am using the raspberry in a christmas present, I am feeling quite helpless right now...