I realised, that sometimes the notebook will start by pressing the power button and sometimes it would not. Then I decided to open the screws one by one and found out that the outerbody screws posed a problem. If I remove them, then the notebook works, and if they are in, then there just a flash of power button led.
My question, if proper grounding may be the solution to the problem? But I am unable to justify this, because normally mobile devices, anyways are not grounded because they run on batteries.
In my setup, I do not have any ground, because the notebook is being supplied power by a variable power supply that only has two wires. Can this be an issue?
The closest, I could find is something related to this post - Laptop does not boot after unusual static discharge?. I tried to reset the bios by holding down 15 seconds, but unfortunately I do not get a feedback if its a success or not?
Comments would be really helpful.
EDIT 1- after further inspection .
the problem is definetly the screws that connect the lower body and the upper body. BY simply inserting a naked wire through the screw hole between the upper body and the lower body causes the problem of not booting the laptop anymore. That means, I do not even have to tighten and thereby crush anything. Is it possible that an original charger with neutral, live and earth will solve this problem?