The power consumption when it's asleep is about 3 watts, which impinges noticeably on neither money nor the environment.
As a collective I disagree.
If we all powered off standby lights in the UK it is estimated that two power stations could be decommissioned from just extinguishing those insignificant LEDs. UK energy experts state that approximately 7% of our energy is wasted by needlessly leaving on standby lights - US research indicates 5%.
My computer system has a total of 20 led lights, modem (4 lights - unit can get very hot), two monitors, computer, extension socket, UPS, printer and 4 drive JBOD (10 lights). Turning the system off and unplugging for 8-10 hours per night uses less energy than sleep mode - shutting down takes barely any energy. Sleep mode is important for daily use where the computer is used intermittently.
The Ford motor company estimates that it will save 1.2 million dollars by turning off their computers in the evenings and weekends.http://www.prnewswire.com/news-releases/sh...s-88830487.html
Although rare, electrical devices do spontaneously combust. At the 1997 Ryder Cup I witnessed a laser printer on fire in the press centre. The acrid smoke remained for sometime. It had been left on all night and was not in use at the time. It was just as well that the place was staffed in the early hours that morning.
Advice from the fire brigade is to turn off appliances when not in use, regardless of the current drawn.