Early 2008 iMac Doesn't Boot, Where to Look Next

Discussion in 'Mac Basics and Help' started by derpimpkar, May 1, 2017.

  1. derpimpkar macrumors newbie

    Joined:
    May 1, 2017
    #1
    I picked up an early 2008 iMac 24" that isn't booting. As I'm learning how to troubleshoot these things, I've reached a blockage and I'm looking for next step suggestions.

    iMac:
    Early 2008 24", EMC 2211, El Capitan

    Issue:
    The iMac attempts to boot and stops about 1/2 the way through the progress bar on the Apple logo screen. Sometimes the exact position changes slightly but it's typically 1/2 the way through.

    I took the hard drive out and used my working iMac to install El Capitan on it. I verified it boots to El Capitan and was able to create the initial user successfully. I reinstalled the hard drive.

    Things I've Tried:
    Single User Boot: Successful
    Safe Boot: Unsuccessful, however progress bar goes approximately 2/3 the way through.
    USB Boot: Unsuccessful, however progress bar goes approximately 3/4 the way through.
    DVD Boot: Unsuccessful, however progress bar goes approximately 3/4 the way through.
    Verbose Boot: Unsuccessful, it looks like the log is asynchronous so the order of the message varies slightly but these are typically the last messages -
    - disk1s2: alignment error
    - en1: channel changed to 1
    - AppleLPC::notifyPlatformASPM - registering with plugin with ASPM Support true
    or
    AppleLPC::notifyPlatformASPM - registering with plugin with ASPMGot incomplete channel sequence length 0, should be 16
    - There are two RAM sticks. I took each one out individually to see if it would boot but it's the same case with either one or both. I don't have known good RAM for this system.
    - I've attempted to use diagnostics but pressing "D" when the system starts doesn't seem to do anything. The system will end up in the issue state above.

    Next Steps:
    I think it's a hardware issue at this point. My guess is the logic board or the video board. Forum searches point this way but I haven't seen many with a certain resolution. However, I'm not sure and I don't want to start spending money to rule out parts. Does anyone have suggested next steps?

    Thanks in advance,
    Tom
     
  2. satcomer macrumors 603

    satcomer

    Joined:
    Feb 19, 2008
    Location:
    The Finger Lakes Region
  3. derpimpkar thread starter macrumors newbie

    Joined:
    May 1, 2017
    #4
    Thank you for the suggestions.

    The "/sbin/fsck -fy" command ended with "The volume OSX appears to be OK" so no luck there.

    I also tried the PRAM reset just to rule it out if nothing else. Also no luck.

    I'm going to make the boot USB with the AHT binaries and see what I get there. It sounds promising.

    Tom
     

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