I've had a HP LP2475w for a long time and had nothing but problems, I finally cut my loses and got rid of it a while ago for a Dell 2711.
I finally got around to calibrating it with my Spyder 3 Elite Puck, I had nothing but problems with my HP and calibration and was told it was a difficult monitor to calibrate, but it was also defective and replaced 6 times.
I am having similar issues with the Dell 2711. When I don't calibrate it, it looks decent. When I calibrate it, using the recommended 5800 120 or my preferred 6500 120 or even Native 120 it always has a yellow tint. If I slide a window (like a web browser) across multiple monitors, I can see the tint and it is very noticeable.
No matter what I do, it gives me a tint unless I just keep it uncalibrated. I worked on this with Data Color before and they sent me a replacement puck twice but nothing changed.
Part of the problem is I don't like 120 as I do gaming and a lot more on the computer and I prefer whites to be white and not grey, but even if I pump up the brightness a bit, it still looks yellow.