Hello
I kinda solved my problem with using PuTTY on my Laptop while the Program was still running (on infinite loop). I forcefully press ctrl+shift+c to terminate the running Program and then i can login back to my RevPi peacefully.
Thankyou for your help anyway
Best Regards

Hello
I kind of mess up big time.
I created a program with infinite loop [while = 1]. Then i put this program on .bashrc so it will autorun everytime i reboot my RevPi.
Worst thing is, i activated autologin as well, so i wont have to give my username and password to start the revpi.

And now ...