Yes I know it sounds impossible, but I have no other idea. I put a 100GB HDD into my MB (exact same brand - Seagate - as the stock one that came with my MB) and like anyone else I used the backup of my User/Library folder to restore the settings, preferences, etc. Well I used my personalised colour profile from my 60GB HDD and when I restarted I noticed my screen seems deeper in colour, clearer or sharper. No it's not me and it's not a placebo. I'm just not sure how this could be though.