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
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
