Color problem in OS X : Some gray tint became yellow!

[/V\acpower]

ok, today i opended up my mac, and it looked like this :

It seems that particular shades of grey are being displayed yellow instead. (The menu bar from Apple.com is quite evident, and on the image you can notice the Dock being vaguely yellowish.)

This don't appear to be a calibration problem for 2 reasons :

1 - It don't matter if i go back to previous calibration setting, like default.
2 - Normally a calibration would not show problems even with a direct screenshot from the OS.

Reason #2 is also the reason why it could not be a screen problem (i have an external monitor and it is on both.)

Also, interesting fact : When booting in Windows XP, everything is showing up perfectly fine, even Apple.com.

So, this happen only in MAC OS X, I run Leopard 10.5.4 (with all the update.)

Also, yesterday I recalibrated my screens, but this yellow thing wasn't there yesterday even after all the recalibration, it really appeared this morning when i opened up my MacBook Pro (SR 15', 2.2).

I really don't have a clue on how to "fix" this. I need your help.

Thanks in advance!