The Computer Buzz

November 26th, 2009

Nome and Paul Van Middlesworth - owners - The Computer Factory
 

Turn It Off

It continues to amaze us that so many people still believe a computer once turned on, should be left on forever. Even North County Times computer columnist Don Edrington a couple of years ago wrote that leaving your PC on 24/7 was no big deal. Stick to software Don. Leaving your computer on 24/7 is a bad idea. Turn it off when you are not using it. At least let it rest at night.

Back in the 60s, 70s and 80s computers and terminals were delicate things stuffed with discrete analogue components. There were some very good reasons to leave computer systems running 24/7. Systems needed to be kept at a constant temperature in order to function optimally. Boot up procedures were complicated and uncertain. Computers also required a lot of electrical energy and cold starts could stress the components.

None of these factors apply with modern PCs. Today’s computers use low energy, solid-state components that are very stable at a wide range of temperatures. Boot sequences are safe and sure. Modern PCs have switching power supplies and low power components so start-up no longer causes component stress.

Running your computer 24 hours a day can reduce its lifespan in several ways. When your computer is on, power supply and CPU fans are always running. While these parts are designed for durability, they do have bearings and they will eventually fail. While these fans move air through your computer, they also move dust through your computer. Your computer is acting as a low efficiency air filter. Unless you remove the cover and blow out your computer, dust will accumulate at several critical points. As dust builds up and airflow diminishes your system starts to run hot. Heat can shorten the life of your systems components.

Leaving your system on increases your vulnerability to power surges. If you have a short or fan failure while your system is unattended, damage or even fire could result. While the chance of a fire occurring is extremely remote, unless you have a pressing need to leave your computer on, there is no point in taking the chance.

Another reason for shutting down your computer is that the Windows operating systems have utilities that check your system on boot-up and correct errors. Virus and spyware scans use your system’s boot sequence to your advantage. As you use your computer, many programs and web sites leave pieces of their programming behind in your RAM. Your computer will begin to slow as your available resources drop. Re-booting your computer gives your RAM a fresh start.

There are 168 hours in a week, 8736 in a year. The difference between allowing your PC to run 24/7 and cutting that time in half is about $120 a year in energy cost at SDG & E’s current rates.

So if you and Don Edrington want to waste money, energy and prematurely wear out your PC, be our guest. We’ll be happy to fix your PCs when they go blooey.