Leave the Computer On or Turn It Off?
If you’re wondering when to turn your computer off for energy savings, here are some general guidelines from the U.S. Department of Energy.    Personal computers use about the same amount of energy to start up as they use when they are on for about two seconds. If you aren’t going to use your PC for more than 20 minutes, turn off the monitor. If you aren’t going to use your PC for more than 2 hours, turn off both the CPU and monitor.    Many PCs today come with a power-down or “sleep” mode. ENERGY STAR® qualified computers power down to a sleep mode that uses about 70 percent less power than without power management features. This feature must be set up through your system software.    Screen savers are not energy savers, and the power-down feature may not work if you have a screen saver activated.