Until I came across this article, I thoroughly believed turning our PCs on and off wears it out - but it is not anymore.
Turning your PC off uses more energy than leaving it on. Not true. The small surge of power you use when turning it on ? which varies per PC make and model ? is still much smaller than the amount you use in keeping it on for lengthy periods.
Turning your PC on and off wears it out. Five or more years ago, there was something to this, but not today, say Hershberg and others. It used to be that PC hard disks did not automatically park their heads when shut off, and that frequent on/off cycling could damage the hard disks. Today's PCs are designed to handle 40,000 on/off cycles before a failure, and that's a number you likely won't reach during the computer's five-to-seven-year life span.
Screen savers save energy. Not true. Screen savers, at a minimum, can use 42 watts; those with 3D graphics can use as much as 114.5 watts, according to Don McCall, a Dell product marketing manager who does power measurement studies for the PC manufacturer. "It's absolutely wrong thinking that a screen saver will save energy," he says.
Your computer uses zero energy when "off." That's true only if it is unplugged. Otherwise, the PC utilizes "flea power," or about 2.3 watts, to maintain local-area network connectivity, among other things, McCall says. In "hibernate" mode, your PC uses the same 2.3 watts; in "sleep" mode, your PC uses about 3.1 watts. Monitors do use zero energy when turned off.
http://www.bcentral.com/articles/enbysk/158.asp
P.S: But I won't start using the PC like a TV after reading this. The longer I keep the PC up, the more I feel my OS is stable. And is "cool".
Threaded Mode