how long can i leave my computer on for?

Discussion in 'Mac Basics and Help' started by southpaw17, Apr 5, 2007.

  1. southpaw17 macrumors member

    Joined:
    Mar 22, 2007
    #1
    I have a mbp and want to upload something to the internet. It will probably take 1.5 hrs. I have to leave the screen saver and energy saver off, because the cpu shuts down when it goes to sleep. Will the screen get damaged from leaving it on for that length of time?
    thanks
     
  2. psychofreak Retired

    psychofreak

    Joined:
    May 16, 2006
    Location:
    London
    #2
    No...
    Plasmas get damaged like that, not LCDs...
     
  3. killmoms macrumors 68040

    killmoms

    Joined:
    Jun 23, 2003
    Location:
    Washington, DC
    #3
    You can leave the display sleeping fine, just set the machine itself to never sleep. There are separate timers in the Energy Saver pane in System Preferences.

    psychofreak: Not entirely true. Plasmas suffer actual burn-in. LCDs can suffer from "residual charge" which can leave a ghostly image of frequently displayed interface elements when other things are displayed. I noticed this on my previous Dell display—I could see a faint OS X menu bar when using Windows on the same display. It's reversible, unlike burn-in, but the symptoms are similar, and to completely reverse them you have to flash the screen with rapid & differing images/colors for an equal amount of time as the residual image spent on the screen, so... effectively it's the same thing.
     
  4. psychofreak Retired

    psychofreak

    Joined:
    May 16, 2006
    Location:
    London
    #4
    Mmm...but I don't think 1.5 hours will do anything bad...
     
  5. Super Macho Man macrumors 6502a

    Super Macho Man

    Joined:
    Jul 24, 2006
    Location:
    Hollywood, CA
    #5
    LCD backlights also get dimmer over time the more they are used.
     
  6. rogersmj macrumors 68020

    rogersmj

    Joined:
    Sep 10, 2006
    Location:
    Indianapolis, IN
    #6
    1.5 hours, are you kidding? That's nothing. The backlight is really the only issue. Just have your display set to go to sleep after 30 or 60 minutes and you're more than fine -- the display can sleep without the machine going to sleep. My iMac hasn't actually been shut down since I bought it six months ago, except when I moved. And I'll often use my MacBook for 4 hours at a time.
     
  7. cubbie5150 macrumors 6502a

    cubbie5150

    Joined:
    Mar 4, 2007
    #7
    The MBP shouldn't go to sleep if an App is using CPU cycles, right? Just let the LCD sleep as normal...
     
  8. GeeYouEye macrumors 68000

    GeeYouEye

    Joined:
    Dec 9, 2001
    Location:
    State of Denial
    #8
    screen saver, display sleep, and machine sleep, and deep sleep, are all different things.

    Screen Savers are usually simply an animation, originally designed to prevent burn-in on CRT's (though occasionally they caused it, thanks SETI@home), though probably the most famous screen saver software, After Dark, included games in some of their later releases. They range from simple to complex, and use CPU or GPU cycles accordingly. They do not interrupt anything, except for poorly coded video applications. There is no power savings.

    Display sleep turns off the display. That's it. It will not interrupt anything, including all video applications. There is commensurate power savings.

    Machine sleep or simply "sleep" (equivalent to Standby or Suspend on Windows) puts the machine in a low-power mode and pauses the CPU. The only activities that may take place during sleep are RAM refresh, and the blinking light. There is significant power savings, and sleeping laptops may remain asleep for days before running out of battery power.

    Deep Sleep, or "safe sleep" (Hibernate on Windows) saves the contents of RAM to disk, and turns off the machine. There is no activity at all, and no power goes to the machine.

    Set up a screen saver or even set display sleep if you like. It won't interrupt your upload.
     
  9. dmw007 macrumors G4

    dmw007

    Joined:
    May 26, 2005
    Location:
    Working for MI-6
    #9

    No, not in only one and a half hours. :)
     
  10. Killyp macrumors 68040

    Killyp

    Joined:
    Jun 14, 2006
    #10
    I leave my MacBook Pro on for hours on end, and it's so far been about 2 weeks without a sleep :) Macs are designed to be left on, you'll have no issues :)
     
  11. iLoveMyMBP macrumors regular

    iLoveMyMBP

    Joined:
    Feb 4, 2007
    Location:
    New York
    #11
    I leave mine on for days at a time...i just push F1 on my mbp to turn off the screen!
     
  12. FJ218700 macrumors 68000

    FJ218700

    Joined:
    Mar 8, 2007
    Location:
    Blue Dot, Red State
    #12
    Is that a dedicated keyboard shortcup on the MBP ? On my 1.67 PBG4 F1 only dims the screen in increments.
     
  13. iLoveMyMBP macrumors regular

    iLoveMyMBP

    Joined:
    Feb 4, 2007
    Location:
    New York
    #13
    yeh thats default for the mbp....try going to system prefs and displays there's gotta be an option in there
     
  14. FJ218700 macrumors 68000

    FJ218700

    Joined:
    Mar 8, 2007
    Location:
    Blue Dot, Red State
    #14
    I don't see anything obvious

    anyone know how to set up a keyboard shortcut to immediately sleep (and wake) the display on a PBG4 1.67 ?
     
  15. lamina macrumors 68000

    lamina

    Joined:
    Mar 9, 2006
    Location:
    Niagara
    #15
    I leave my PowerBook G4 on for weeks at a time. I only really reboot for software updates (when needed). I upload and download stuff constantly.

    Holding the F1 key will eventually turn the screen backlight off entirely. That's what I do overnight.
     
  16. iLoveMyMBP macrumors regular

    iLoveMyMBP

    Joined:
    Feb 4, 2007
    Location:
    New York
    #16


    ummm leeme do some digging i'll get back 2 u
     
  17. beige matchbox macrumors 6502a

    beige matchbox

    Joined:
    Mar 16, 2005
    Location:
    Oxfordshire, UK
    #17
    As lamina said, just hold F1 to turn the brightness down, when it's all the way down the backlight will go off. The LCD itself will still be on, but this isn't a big deal :cool:
     
  18. FJ218700 macrumors 68000

    FJ218700

    Joined:
    Mar 8, 2007
    Location:
    Blue Dot, Red State
    #18
    I understand that, thanks, but was asking about a simple 1-hit keystroke to immediately turn off the backlight (as on the MBP) rather than having to wait the 2 seconds as it dims in small increments. No big deal if there isn't one for a PB.
     
  19. TyPod macrumors 68000

    TyPod

    Joined:
    Nov 2, 2006
    Location:
    And Yourself?
    #19
    If you want, you could leave your computer on 24/7 with possibly no problems. The first thing that would get damaged would be the hard drive, since it has to spin for such a long period of time. A dimming screen would occcur over a long period of time, 1.5 hours shouldn't do anything bad.

    I leave my mac on all day, and put it on sleep when I go to bed. I rarely shut it off or restart.
     
  20. richard4339 macrumors 6502a

    richard4339

    Joined:
    Sep 6, 2006
    Location:
    Illinois
    #20
    Here's my question that I'll add in here...

    How long should the C2D MBP be able to run like this without being plugged in?

    My MBP won't stay on for days on sleep, more like hours, and its barely six months old.
     
  21. TyPod macrumors 68000

    TyPod

    Joined:
    Nov 2, 2006
    Location:
    And Yourself?
    #21
    As far as I know, your MacBook Pro should only lose 1% of it's battery every hour if it's sleeping. Something must be wrong with your battery if it's only staying on for a few hours.
     
  22. BiikeMike macrumors 65816

    BiikeMike

    Joined:
    Sep 17, 2005
    #22
    Correct. My MBP is going back to apple for this very problem (and some others)

    If you have apple care, call them, and say you want to talk to a product specialist. That is their name for manager. The guy said it wasn't the battery, it was probably something with the logic board
     
  23. Plymouthbreezer macrumors 601

    Plymouthbreezer

    Joined:
    Feb 27, 2005
    Location:
    Massachusetts
    #23
    I probabaly shouldn't mention that time I was on my iMac for 14 hours... :rolleyes: :D :p
     
  24. BiikeMike macrumors 65816

    BiikeMike

    Joined:
    Sep 17, 2005
    #24
    Let's all play a game. Go to terminal and type "uptime"

    I have to restart frequently because of other problems, but my MBP is getting shipped to the doctor on monday, so not to worry.

    That being said, i'm only at 11 hours, 44 minutes
     
  25. Plymouthbreezer macrumors 601

    Plymouthbreezer

    Joined:
    Feb 27, 2005
    Location:
    Massachusetts
    #25
    We have a thread for that somewhere.

    I've gone something like 50+ days for some spans of time.
     

Share This Page