It is likely that the HD is dead. Accept it now so it won't hurt so much later.
Go here and buy a $20 Snow Leopard install disk.
http://store.apple.com/us/product/MC573Z/A/mac-os-x-106-snow-leopard
Run it. It will likely say there is no HD to install to.
Have someone technical open it up and verify the HD is dead dead. If so, you can replace it with any number of drives. Best Buy would have them, or you can go online.
This SSD SATA is a good priced one under $100 from a reputable source.
http://www.newegg.com/Product/Produ...21107&ef_id=UkSCxwAABKJ1k3Z9:20131116163402:s
Your technical friend can easily install that and get your CD installing to that drive.
Voila!