Ok, I tried another dvi cable and the screen is perfect !! I can't explain it. Hard to believe I had 2 dud dvi cables.
No backlight bleed, banding that I can see.
Just 1 dead pixel in top left quadrant of screen. black dot. annoying when doing anything with a light background.
I have a service call open with Dell over the other issue and I could easily get a refurb replacement.
Should I ? There is no guarantee I would get a perfect monitor at all.
However because it's a next business day swap out warranty I can basically say what I want to the tech support. I know it sounds dishonest but I don't subscribe to this you have to have 4-6 dead pixels before we do squat policy. I could easily get a replacement over this blue line issue and if I get a screen with backlight bleed, a01 firmware or even 1 dead or stuck pixel, get another replacement ad infinitum till I get a perfect screen. That's what I am leaning towards doing now.