Really strange graphic card pc monitor and TV problem

Worugru

TS Rookie
Hello there, so here is the really weird problem I am having

When I connect pc to pc monitor, it gives black screen (the ms-dos screen were you have the "_" blinking on the left top)

When I connect pc to my TV, it works all good.

Here is the strange part:

When I connect my pc to my TV and it works, if I unplug the cord and connect it back to pc monitor, without shutting down the pc, IT WORKS! ...

graphic card : geforce750, hdmi cable

Any idea what is going on and how to fix it?