Stuart Oliver

Q: iMac (EMC 2134) Not Starting

Hi,

 

My son's iMac (24" Mid 2007) has developed a problem where after the initial chime on startup it simply turns off.

 

I have opened it up to check the LEDs and the first LED is on when the power is connected. When I press the power button LEDs 2 and 3 are lit. However, after the initial chime, the LEDs are extinguished and the computer turns off. Disconnecting the power and plugging back in turns LED 1 back on.

 

Any idea what the problem is and whether it can be fixed?

 

Thanks,

Posted on Jan 18, 2016 2:56 AM

Close

Q: iMac (EMC 2134) Not Starting

  • All replies
  • Helpful answers

  • by D.Cohen,

    D.Cohen D.Cohen Jan 18, 2016 3:00 AM in response to Stuart Oliver
    Level 6 (8,424 points)
    Desktops
    Jan 18, 2016 3:00 AM in response to Stuart Oliver

    Take a look at the steps suggested by Apple in this article:

    If your Mac won't turn on - Apple Support


    Try Safe Boot:


    - Shut down your Mac

    - Wait until your computer turns off and after that press the Power button

    - Right after you hear the startup tone, press and hold the Shift key

    - Release the Shift key when you see a grey Apple sign and the progress bar below this sign

    - After your Mac boots up, restart it as you usually do.


    If this doesn't help, follow the instructions below:


    - Shut down your Mac

    - Wait until your computer turns off and after that press the Power button

    - Right after you hear the startup tone, press and hold the Shift key

    - Release the Shift key when you see a grey Apple sign and the progress bar below this sign

    - Once you see Desktop, start a Disk Utility scan to detect and repair file system errors (don't forget to choose your main hard drive)

    - Click on Verify Disk and then, if asked to fix problems, on Repair Disk

    - After this, click on Verify Disk Permissions and then on Repair Disk Permissions

    - After the process is finished, shut down your Mac and turn it back on after about 30 seconds


    Apart from that, take a look at this Apple article and follow the instructions on Resetting NVRAM shown there: How to Reset NVRAM on your Mac - Apple Support


    Try resetting the System Management Controller: https://support.apple.com/en-us/HT201295


    Hope this helps!

  • by Stuart Oliver,

    Stuart Oliver Stuart Oliver Jan 18, 2016 3:29 AM in response to D.Cohen
    Level 1 (5 points)
    Jan 18, 2016 3:29 AM in response to D.Cohen

    Hi,

     

    Thanks for the reply but it doesn't get as far as playing the entire startup chime so I don't think this will help. I will try again though, just in case.

     

    I think the problem can be explained by the LEDs going out but I don't know what the answer is.

     

    S

  • by Mike Sombrio,

    Mike Sombrio Mike Sombrio Jan 18, 2016 3:37 AM in response to Stuart Oliver
    Level 6 (17,234 points)
    Apple Watch
    Jan 18, 2016 3:37 AM in response to Stuart Oliver

    Looking at an iFixIt guide is that a PRAM battery next to the right speaker? I would change that, reset the SMC and PRAM and see if she'll start.

    https://www.ifixit.com/Guide/iMac+Intel+24-Inch+EMC+2134+and+2211+Hard+Drive+Rep lacement/8968