Unlike my old G5 iMac, there is no LED light on my new aluminium iMac to show it is asleep. Is there a way for the new Mac to indicate it is in sleep mode? Apple support was no help. One guy said there should be a "light on the right hand side." I presume he meant on the actual display. The second techie said she didn't think so. No one got back to me with a definitive answer.