I think my hard drive may be faulty

iI recently purchased a second hand iMac - 27" mid 2010. Things have been going well, I 'defaulted' the machine, re-installed OS X from the original DVD and purchased/upgraded to the latest version (OS X Mountain Lion 10.8.5).
After 'tinkering' with iTunes yesterday evening and shutting down - on reboot this morning I have had all sorts of problems. I have used disk utilities, verify disk and subsequently disk repair from the original OS DVD. I got a message saying "Error: Disk Utility can't repair this disk ... re-format the disk and restore backup files. Since there was no reformat option I chose the local hard drive, and erase option.
5 - 6 hours later and numerous attempts to reboot (with and without the OS DVD) I believe my hard drive has failed. The final 'symptoms' are - unable to see a local hard drive (only the DVD drive) in disk utilities - clicking sound from the disk and a 'flashing' folder sign with a ? on screen (without the OS DVD). I am 'fearing' the worst and assuming I need to take my iMac to the nearest authorised Apple dealer?
Any advice gratefully received !!!

By means of an update and reply to my own question it appears that my hard drive was in deed faulty. I was 'lucky' in that the drive was covered under the Apple extension program (thank you Apple!) and has since been replaced very satifactorily by an authorised service provider (Western Computers in Cheltenham who provided an excellent service!).
I now have my treasured iMac back and am busily upgrading to Mavericks. My faith in Apple has been fully restored!
By the way, the 'Out of Warranty Repair Cost' would have been £230.84.

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    null

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