Use the yellow hue software to fix your pink hue.. yellow plus pink = white?
Kidding, if you have bought the laptop from Pakistan you can always go back to the retailer and ask them how you can claim the warranty, otherwise try the contacts on your warranty card. If it is bought form Pakistan I don't think there would be any charges. If you are willing to travel, I remember there used to be an official HP shop in barkat market Garden Town (opp. KFC).