Allgemeines Diskussions-Forum » DVI: no signal?!

Hi, i have got another problem, this time it's a problem with DVI, when i press on the monitor two times
(This is a random picture from google)

Also, weird things is on my computer screen, i don't know how to describe it. but when i move the VGA cable, some of these things disappear but they return again when i stop moving the VGA cable, they are mostly small lines like this (They are white lines)
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I can't describe it exactly, but i think that DVI is causing the problem
Please Help.
Thanks !

I didn't find the right solution from the internet.
References:
- https://www.computerforum.com/threads/dvi-no-signal.242281/
- Consumer Services Video Examples