I've been seeing [by google] that a lot of people with the aluminum iMacs say that they don't have a sleep light. Well, I moved my 24" iMac to my bedstand and when I put it to sleep, I noticed a very dim pulsing light coming from the bottom right corner. Is that not the sleep light, or are my eyes just playing tricks on me? I could see it was making a shadow of the speaker grille so there has to be a light there. Is there a way to make it brighter?