I´m having difficulties managing the brightness and power alternatives on my brand new machine. When I try to regulate via brighness buttons on keyboard - up or down - nothing happens to the screen. When I go into power options, I can regulate to full brightness by hitting "Reduce brightness when ..." and at the same time pressing keyboard button (f2). But only with this combination will I manage to get to full brightness. I first thought the screen was ridiculously dim, but at full brightness it´s ok. Compared to my iMac (fall 2008), it is mildly dissapointing though. Something is wrong?