Hi!! First of all, i am new to this forum, and my english is not perfect. I have a question. I just bought my self the new iMac (20") and it is perfect. But I think that there is a little problem. The brightness is playing weird i think. I am working normally on my imac and then the brightness begins to flash for some sec. Sometimes it stops quickly, and then again this continues for a little longer. It looks like, the brightness if getting brighter and then lower. Is this something to worry???