My Macbook Pro displays a grey screen and a no entry sign. Help!

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hi everyone, 2 nights ago whilst working on word document , surfing net, facebook running, mac pro, decided freeze on me. had spinning rainbow wheel. had turn off , restart.

on restarting, got initial grey apple screen, spinning round grey wheel. after bit of time prohibitive (white, no entry) sign appears , won't load.
have tried in mac bible , took authorised mac reseller, , can't seem sort it.
won't recognise discs, when won't allow installation of mac operating system on laptop.
did hardware test , comes fine.
have heard corrupt file or making mac think doesn't have valid operating system.
please, suggestions help. :/
 

looks dead hard drive me.
 


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