Replaced HDD in early iMac but won't boot up

Hi,
I'm new to the Apple support communities and require help please.
I have an early 2008 iMac and was currently running ML; however it suffered a HDD failure. I have replaced the original 500GB HD with a 1TB WD Black Cavier HDD and started the machine up using the original disk with 10.5 and formatted the new HDD by using Disc Utility from this. I then carried out a complete restore to my last back up using Time Machine/Capsule. However when trying to start up with the restored 10.8.5 the machine won't boot up and just goes around in a cycle that also produces kernal panic. I have also gone back and loaded 10.5 and the machine works fine and then restored 10.8.5 again but the same happens.
I have carried out the AHT three times using the extendered version and each time there was nothing reported with regards to the hardware. I have also tried all of the various methods mentioned within various threads but none work.
Do you please have any ideas that may help or should I just take the machine straight into my Apple store?
Many thanks

I don't think you have a hardware problem since you can install 10.5 and the machine boots up normally. I believe your time machine backup is somehow corrupt. Maybe something on Pondini's site can help you
http://pondini.org/TM/Home.html

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