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

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Here is a strange one,<br />
<br />
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. <br />
<br />
I was able to format and install the os. &nbsp;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. <br />
<br />
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<br />
<br />
When I restarted, It did not see the drive. <br />
<br />
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.<br />
<br />
I have reset the PMU, reseat the ram, without any progress.<br />
<br />
I have never seen this behavior before, I would appreciated any feedback.
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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.

Imac G5 keeps has trouble booting from new hard drive

All of Apple's hardware is produced solely by Apple Inc., who determines internal systems, designs, and prices. Apple buys certain components wholesale from third-party manufacturers. The current Mac product family uses Intel x86-64 processors. All Mac models ship with at least 1 GB RAM as standard. Current Mac computers use ATI Radeon or nVidia GeForce graphics cards and include a dual-function DVD and CD burner, called the SuperDrive. Current Apple hardware includes the iPad, iPhone, iMac, Mac Pro, Macbook, iPod and Apple TV. Discontinued hardware includes the Apple I, Apple II, and the Apple III, the Lisa, the Newton, the Quadra, Performa, Centris, Macintosh II and LC series, the Power Macintosh, iBooks and the MacBook.