Does anybody know what's wrong with my monitor

[postmortemIA]

Lower right corner responds poorly to most colors (except full white and blue). It is an old-but-good Dell 2707WFP (27" Samsung PVA)
Is it problem with polarizer?
I haven't seen anything like this.
Here's the image I took with my phone:

http://imgur.com/JX71sew

 

[Annisman*]

I don't know what the problem is, but there are a few answers. Here's one of them for example: http://www.amazon.com/BenQ-XL2720Z-2...=gsync+monitor