I have a Lexmark Optra and instead of flicking the switch on the back off and on whenever I use it, I just leave it on. I guess it is energy star rated and goes into a power saving mode when it isn't printing, but you can't tell if it is or not. There are times when I use it everyday and then times were it will sit for a week without use. Dose it matter if I leave it turned on for those long periods of in activity? Dose any of that fuser, charger, heater stuff stay charged?