Answer by Duodave · Jan 03, 2012 at 04:35 PM
This is an ongoing debate, with people taking each side. I say if you need your computer for something overnight there is no problem with leaving it on (like an overnight scan, or if you simply want to archive the chat of an IRC channel when you're not there).
But if you want to conserve power, for example, by turning it off, it does not reduce the computer's lifespan to turn it off when it's not being used.
I do not recommend turning it off and on several times in a day. Personally I recommend turning it off at night and on in the AM and leaving it on all day. Or if you have a laptop, sleep it at night or when its idle, shutting down can be optional.
Answer by roguekiller23231 · Jan 03, 2012 at 05:27 PM
not really, the only issues you might come across with leaving your computer on all night is:
your fans will ware out because they have been on for a longer period of time.
if you leave your monitor on, it could cause a burn in effect.
HDD's will ware out the moter
and dust build up.
not Huge issues really, Components are not stressed, servers and work stations stay on 24 hours a day, offices and other buildings usually have there computers on running 24 hours a day.
Answer by CyberTourniquet · Jan 04, 2012 at 04:00 AM
If you have proper cooling system, it's not harmful at all.
I built my own computer in 2010 and it's been more than 1 year. I usually turn off the computer every 1 month to clean up the dust inside.
The reason why I leave my computer turn on all the time because most of the time I need quick access to the computer without having to wait for the computer to boot up. And also I work from home with my computer.
Never have any problem so far. Nothing broken or burned.
Just keep the computer cool and you'll be good.