2006 imac randomly shuts off

Discussion in 'iMac' started by sgiera, Jan 2, 2015.

  1. sgiera macrumors member

    Mar 25, 2014
    Need some help, my 2006 imac suddenly shuts down. I turn it back on and it works fine. Sometimes, it's 3 weeks or twice a day when it happens. Any suggestions. Been doing this for the last two years. I did replace the hard drive about a year ago with a 3tb hard drive and seems to have the same issue as with the old hard drive.

    Thank you!!!
  2. hologram macrumors 6502

    May 12, 2007
    Does it shut down completely (power off), or does it go to sleep with a black screen?

    Mine was going to a black screen, but would come back to life if I waited a moment and hit a key. It turned out to be a heat issue. I used smcFan Control to ramp up the fans and it never happened again over the next 6 months.

    It's free, so you have nothing to lose by trying it.
  3. fastlanephil macrumors 65816


    Nov 17, 2007
    I remember my iMac was going to sleep but you couldn't wake it up unless you pressed the power button and sometimes you had to restart it.

    Try repairing disk permissions, resetting the PRAM and SMU. Doing a web search will tell you how to perform these easy procedures.
  4. fastlanephil macrumors 65816


    Nov 17, 2007
    Come to think of it it actually turned out to be a power supply issue. I moved my Mac into another room by itself and the problem went away. I think it could have been my power strip(s) setup and other devices. I moved things around to different outlets and that took care of the problem.
  5. LizKat macrumors 601


    Aug 5, 2004
    Catskill Mountains
    My sister had this problem and solved it with an uninterruptible power supply. Dirty power can be unkind to desktops.

Share This Page