I noticed this morning that the light blue/white horizontal strips in my file listing windows weren't showing up. On closer inspection, light blues in general were not showing up well on anything and gradients were stepping. It reminds me of the difference between selecting thousands of colour and millions of colours in OS9. Full colour images are appearing flatter with noticeable stepping on extreme light/dark areas. It's a 2008 24" with an ATI Radeon HD 2600 Pro with 256MB running Snow Leopard. I've checked it agains another identical machine I have and there's definitely a difference. I've re-calibrated the screen and that's made little or no difference. Would it be the card or physically the screen?