IMac won't boot to install disk, normally or in safe mode! Please help

Hi everyone,
I'm using my iPhone so please excuse any spelling or grammatical errors.
I have a 27" quad-core iMac bought about a year ago.
Today I went to reformat the harddrive as I'm selling the machine to a friend. First the iMac would not boot to the install disk - it just gets stuck on the apple logo screen, but with no spinning wheel - now it won't even start up normally! I've attempted to start up in safe-mode but again it gets stuck on the apple screen and there's a strange clicking noise, which sounded like it was coming from the cd drive area.
It's a shame this happened today, right before I was supposed to give the computer to it's new owner. I really don't want them to think I was trying to sell them a computer with problems.
I've tried a basic hardware test and it came back with no problems.
Can anyone help?

Try using the original Install Disc that came with the machine, do not try any other DVD. Put it in the SuperDrive, while holding down the power button also hold down the Option button on the keyboard. It should start and give you the option of starting from either the internal HD or the Install Disc. Choose the Install Disc, select the language, choose the Utilities Menu, Disk Utility, then select the internal HD, select the Erase tab and set it to Mac OS Extended (Journaled) and click erase. Then exit Disk Utility and continue with the install process to reload OS X.
Roger

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