My screen has gone pink, will buying a new monitor fix it, if the video card is faulty?

You can only sort it out by substitution.as other poster said ,try the screen on another pc or laptop with a vga/dvi output .if its still pink then check the card.It may be overheating and full of fluff so clean it.If that does'nt work then try another card,I reccommend ATI cards as they run a lot cooler and are more evolved.Another problem maybe that you've added some extra hardware thats sapped your power supply and the vid card can't get enough juice,but this last fault is unlikely with a 500watt plus power supply unless its a monster video card.