This is what Ive done to try to fix the problem:
set monitor to full brightness and contrast
(a little better)
reinstalled graphics card drivers
(no change)
changed brightness and contrast settings for overlays, under "display" in controll panel
(in a screenshot, dark parts remain relatively dark and bright parts become too bright. basicly it doesnt help much. its as if jacking up the brightness only effects the bright parts of the picture. If i get one video set right, then another video will be too bright or too dark)
even when I upgraded my graphics card the problem carried on unchanged
Any suggestions?