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What are you opinions on this?

Do you leave you're computer on 24/7 or do you turn in off?

Does it use more energy booting it up everyday or to leave it on 24/7?

asked Aug 03 '11 at 11:46

Callum%20Lord's gravatar image

Callum Lord

edited Aug 03 '11 at 12:08

Turning it on and off every day doesn't nearly take as much energy as leaving it on. You computer even uses more energy in sleep mode than being off, because the RAM is still active. The only advantage I see to leaving a computer on all night is if it's a server, and scores of people need to access data whenever they need to, or if you're rendering something like video, and it is a really long and high quality project.

I personally have my iMac set to turn on at a certain time, and then my alarm clock goes off, so that my computer is ready as soon as I wake up.

answered Aug 03 '11 at 11:53

catchatyou's gravatar image


I take it you have that set in the EFI system?

(Aug 03 '11 at 11:56) Callum Lord Callum%20Lord's gravatar image

Macs don't have a BIOS they use the EFI system. I believe that turning on by itself feature is build into the operating system.

(Aug 03 '11 at 12:09) Ebotman16 Ebotman16's gravatar image

Its built into system prefs -> power saving -> schedule... (the turn on / off thing)

(Aug 03 '11 at 12:13) barnsleynut barnsleynut's gravatar image

Barnsleynut explains what I'm talking about for automatically waking up my computer.

(Aug 03 '11 at 14:10) catchatyou catchatyou's gravatar image

Based on my own tests, at least in my case, turning off my PC overnight has resulted in a power saving. I used to leave two PC's (both with 750W PSU's) running overnight doing background tasks, housekeeping etc. But after getting doing some testing with a household power meter, over a period of a week with the machine running 24/7 compared to switching off overnight, it saved me a few pennies (I can't remember the exact figures as it was about a year ago). In my case, both computers were not sat idle over night, they would have been busy backing up to two or three NAS units, so there would also have been a switch, a router, 3 Buffalo NAS. Both LCD Monitors would have been on, but in Power Save mode.

I had basically set up both PC's to do all their daily AV/AM/AS scans over night, daily backups/sync, defrags / registry cleanups etc etc. Another reason for not doing that now is that it's all pretty much done in real-time during the day on my current set-up.

I will try and dig up the actual values that it calculated I saved... We are talking a few UKP's a year, but not mega bucks...


answered Aug 03 '11 at 12:03

Chris%20Wright's gravatar image

Chris Wright

The Computer will use less power when it it turned off, but turning it on and off 4 or 5 times a day "may" cause your computer to not last as long, as a computer that is just left on during the day. If you have a SSD you will not have that much problems as a Optical drive with moving parts! Well I Hope This Helps You Out! :D

answered Aug 03 '11 at 13:57

Master%2018's gravatar image

Master 18

I was not looking for help, it was a general question. :)

(Aug 04 '11 at 09:16) Callum Lord Callum%20Lord's gravatar image

turning off the comp everyday is still very hard on hdd's. as for using less power i would say since the average person is only going to turn it on once during the day less power is used than when it is left on 24/7. now if you are in the habit of turning it off every time you leave the room(say 4 times during the day) you are going to use more power than you would leaving it on 24/7.

answered Aug 04 '11 at 10:23

ChuckysChild's gravatar image


I put mine on Standby. It barley uses any power but takes little time to start/stop.

answered Aug 04 '11 at 11:15

gppl's gravatar image


I leave my laptop on overnight because I normally watch TV on it and end up falling asleep. I think it goes to sleep though. I don't leave the laptop on when I'm using my PC (like now).

I don't leave my PC on all of the time because the box and screen combined use a fair amount of power. There is no real need to leave your computer on all the time as even with a mechanical hard drive the PC will be turned on by the time you have made a drink or put toast in the toaster.

If you have to leave a download running while you get shut eye then you should set the option in the OS to turn off after XXX amount of time when the computer is idle or if you are using a download manager then these often have options to turn the computer off when download complete.

Annoyingly my PC is never really OFF as with the PSU switch turned on it powers an LED on the motherboard to tell me it works. With this power it allowes PS2 keyboards to activate the PC (via bios) to turn it on so this equates to the old chestnut of 'how do you know the machine is really off' unless you un-plug the sockets each night, but how many people can be bothered to do that as sockets are often buried behind furniture that's hard to get to.

There is a belief that turning the computer off degrades the life span of the components due to being cooled and warmed.

Although the power is still in the national grid and has been generated whether you use it or not so theoretically you are not being that much more eco friendly (if this bothers you!) by turning it off.

So why do I turn my machines off? Well it's like leaving the tap on. It's not that big of a deal, but if everyone leaves the taps on then you're going to start having problems.

answered Aug 04 '11 at 19:30

SignOff's gravatar image


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Asked: Aug 03 '11 at 11:46

Seen: 6,926 times

Last updated: Aug 04 '11 at 19:30