[SOLVED] Touching or moving PC even slightly causes "no signal" on monitor ?

[WebowJo]

If I even hit it by mistake with chair or leg very slightly - the screen goes dark
I thought its faulty cable (DP] - replaced it
I thought its faulty GPU - replaced it
Thought it might be the PCIE x16 Connector, so I plugged it to another one, problem persists.
I thought maybe the GPU is so heavy it moves so I bought a bracket that holds it firmly to place - no
what kind of demon is possessing my pc? how do I exorcise it? I cant even more it to do small things like adding ssd or cleaning it...

many thanks

 

[dotas1]

Two things come in mind. You got a short somewhere or this:

View: https://youtu.be/W62vlsIGzY4