As soon as I activate Code::Blocks my screen becomes dark for a second and then it works with a lot less colours.
When I turn off Code::Blocks , the screen becomes dark again and then all the colours are back to normal.
You can see what happens to my screen when Code::Blocks is on and the normal screen , when Code::Blocks is off.
I hope it's the whole problem and not only a sympthom of a basic problem.