IMac not booting after putting HDD in windows machine

Hi, I'm helping a friend repair an iMac G5 ALS (before the iSight ones)
The main problem is that it keeps switching itself off, or just not turning on at all, but i have ordered a new power supply to fix that.
The other problem is that, before I did anything to the mac, I put the hard drive in to my Windows Vista machine to back up important files. But the drive didnt appear in My Computer. So, I right-clicked on My Computer, went to Manage and then the Disk Management service. From here I right-clicked on the Mac drive that had appeared on this menu and then clicked 'Initialize' (I had done this before on a Windows HDD so it seamed like the logical thing to do) but nothing happened. (I now know that it wasn't recognized by Windows because of the different filesystem on macs)
I put the HDD back in the mac and waited for it to start playing ball. Eventually it decided to turn on, but instead of booting, it came up with the flashing question mark folder. I put the Leopard disk I have into the machine and it booted to the Leopard installer.
Using the disk utility I found that the hard drive was there so I verified and repaired it and rebooted but still just the flashing question mark folder comes up.
I'm fairly certain that it was the 'Initializing' that caused all the boot problems.
Any ideas anyone? Cheers in advance.

Welcome to Discussions - you will have to reinitialize the hard drive as Mac OS Extended (journaled) before it can be recognized by the machine. Boot from the Leopard disc and after you have selected English as your language, go to Tools (or whatever it is called, I don't have it in front of me)in the menu bar and select Disk Utility and reformat the drive.

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