BarbaraMN said:
Running windows XP at home, using dial-up, virus check and firewall
Recently switched to XP from W98 where I left the computer on all day, with
a screensaver running all day. This new computer I have been turning off
and on several times a day and not running a screensaver. Is all that off &
on switching going to cause a problem? Thanks
Turning a computer on and off multiple times a day is pretty much the
worst thing you can do.
Two main reasons:
1. The microchips and the circuit boards inside a computer are
composed of multiple layers of different types of materials. When
power is applied these components heat up and when the power is shut
off they cool down. All materials expand when they are heated and
contract when they cool down. And different materisls expand and
contract at different rates. This repeated expansion and contraction
will cause stresses at the points where these materials join because
they are expanding and contracting by different amounts. Repeated
stressing will eventually cause the equivalent of metal fatigue in
these materials resulting in failure of the join.
2. The hard drive in a computer is powered by an electric motor. All
electric motors are under the greatest loads and stresses when they
are first powered up, and that is when they are most likely to fail.
How often have you seen an electric motor fail while it was running at
normal speed? It does happen, but far more likely is that the
electric motor (washing machine, refrigerator, starter motor in your
car, whatever) will fail when it is turned on and power first begins
to flow. The more often an electric motor is powered on and off the
more likelihood there is of a failure during startup.
My basic motto is either "on and off once a day" or "leave running
24/7" - the pros and cons of each are pretty much equal.
Good luck
Ron Martell Duncan B.C. Canada
--
Microsoft MVP
On-Line Help Computer Service
http://onlinehelp.bc.ca
"The reason computer chips are so small is computers don't eat much."