Has anyone noticed that some iMac G5 20 inch models screens are immensely bright that everything looks really clear and almost white like bleach. Not sure if I'm explaining this correctly. Even turning down the brightness dosen't make any of the text darker....Everything has very white tones. Do most of you with iMac 20inch models calibrate your screens? I've noticed this huge brightness on some models, but when I'm at the Apple store I noticed that theirs are very rich in color much darker, not as bright despite the brightness being high. All the details stand out.