Start up problems with G5 I-Mac

My I-mac G5 is refusing to start. It variously goes to a screen with a question mark, alternating to a folder icon, eventually gets to the grey apple screen and progress indicator, stays on this screen for approx 3 - 5 minutes before the cooling fan cuts in and then it shuts itself down. I've done a hardware test - all okay and have tried to re-install the operating software off the discs, but when I get to selecting the destination drive to load the OS, there is no destination to select and the continue button is blanked out. Any suggestions??

Your Hard Drive is not necessarily dead.
Have you tried starting up in safe mode, by holding down the S key on start up?
Before you go to the extremes of replacing it try DiskWarrior [http://www.alsoft.com>, which comes as a boot up CD. In many cases I have found it gets things going again and/or at least helps you get everything off the drive. TechTools Pro [http://www.micromat.com/index.php?option=com_frontpage&Itemid=104] can also help especially with a thorough HardWare check but is not as effective at getting HDs back up and running. Do NOT ever use Norton's Utilities!
Have you tried finding the drive, repairing it and mounting it from the Disk Utility on your installation DVD? When you start up in the DVD's installer you can switch to the copy of Disk Utility which is on the DVD.
Have an external bootable Hard Drive (FireWire & some USBs) ready to backup everything from the drive, just in case you only get one shot at this.
When/if you get access to your drive, use Disk Utility to select the Drive (not the "volume" which is on the drive). Down the bottom of the Disk Utility window then will be a report on the status of the drive, including the S.M.A.R.T. status which is supposed to give you early warning of any hardware problems.

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