I've got a new 12" Powerbook. When I put it to sleep the latch button pulses (or breathes) like it's supposed to. However, yesterday I noticed that it seems to breathe at two different intensities. There's a dim breathing and a bright breathing. I've sat and watched it switch between the two. I hope I'm explaining it well... Basically it's like it pulses at half the brightness it usually does.. then it will arbitrarily switch to full brightness pulsing. Does this mean anything? I was thinking maybe it was detecting a WiFi network or something, but I know that's extremely wishfull thinking. Thanks in advance.