Cannot recognise hard drive

Hi there,
I am hoping for some pearls of wisdom. My iMac G5 died last week ie it came on but didn't get passed the Apple and whizzing wheel icons. I tried to start from the Tiger DVD which, on first go, said choose where to install and I chose the hard drive. Then nothing further happened. Then I tried again and the hard drive option had disappeared.
I took it to Genius and they ran Disk Warrior and decided that the hard drive was toast.
So, I followed advice and have just received new Seagate drive from ebuyer which I have installed. Unfortunately the same thing is happening although this time I can get to disk utility which says I have the correct drive installed but just doesn't show as an install option.
Help please because I am very stumped.
Thanks,
John

You need to format the drive as MAc OS Extended (journaled) and then it will be functional and able to have an OS installed on it.

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edited

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Reply
Hi James,
I'm not clear on some things:
"Rebooting from OSX disk hangs with a circle slash.
Same if I try to reboot with Diskwarrior CD or TTPro.
Removing the hard drive has the same result.
Correct. I cannot boot from ANY bootable CD except AHT, not even with the internal drive completely disconnected.
Booting from an external firewire utility drive is
successful, however I'm unable to successfully
reformat the hard drive. Disk Utility sees the drive,
and begins to reformat, but hangs at about 10%, and
it instantly shows more than 10 partitions but none
of them successfully are created. Drive Genius just
fails to initialize.
I tried a different hard drive, same result.
Apple Hardware Test and TTpro all show that hardware
is OK."
First you say you can't boot with DW or TTP, then you
say AHT and TTP show hardware is OK. So you
can boot with DW and TTP?
I cannot boot from ANY CD. But I CAN boot from an external firewire drive. My iPod is a diagnostic drive, which includes TTP and AHT. Oh, and I CAN boot from an AHT CD but only into AHT, not beyond AHT into the finder.
Are you running an OS on the external HD that's at
least as new as the one that originally shipped on
the PB?
Yes. It's the brand new version of Protogo that just came out in Jan 07. I've also tried CD's from 9.1 to 10.4.
Have you reseated your RAM? Tried with just one
module? Switched that module to the other slot?
Repeated same process with other module?
Yes, that was actually the first thing I tried.
If still no luck, try removing the bottom cover,
gently snugging up all the screws you can find,
flipping the keyboard up and doing the same, then try
booting (with bottom cover off).
If still no luck, I would try the
href="http://www.posner.net/marc/projects/TiBook/TiBoo
k.html">Orange Ribbon Cable Fix.
If still no luck, sounds like a logic board issue, or
possible the display cables in the hinges.
Tried that too...no change.

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All,
I've tried to search with no luck.
I'm working in a serverless mac/pc environment. I have a mybook attached via firewire to a mac used for backup purposes. All of the pc's in the office can connect to the mac and it's primary hard drive. They cannot see, let alone connect to, the additional hard drive. All of the macs in the office have the option of choosing a volume when mounting the mac in question. Any ideas?
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