Imac G5 keeps has trouble booting from new hard drive

Posted on 2011-05-03
Last Modified: 2013-11-24
Here is a strange one,

I needed to replace a dead hard drive in an imac g5 20. I put in a 500gb Western Digital sata drive and was able to boot from 10.5.4 retail disk that i cloned onto a firewire drive.

I was able to format and install the os.  When went to restart the machine, it could not find the drive. When I booted from the firewire drive I was able to see the start up drive.

I dug up the original 10.3 discs and follow the same process, I reformatted the disc and did a clean install of operating system

When I restarted, It did not see the drive.

I thought this was a problem with the sensor, so I ran Apple Hardware Test and Tech Tool Pro and did not find anything wrong with the memory, logic board or drive.

I have reset the PMU, reseat the ram, without any progress.

I have never seen this behavior before, I would appreciated any feedback.
Question by:amarks_ny
    LVL 1

    Accepted Solution


    I believe this is due to the new drive being a sata 2 drive(3.0Gbps)and the G5 being a sata 1 controller. This drive is compatible with sata 1(1.5Gbps) by placing a jumper on pin 5-6. This should allow you drive to be seen on boot


    Expert Comment

    if the above response does not work when you format the drive are you formatting as Mac OS Extended Journaled?  

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