Nessuno potrà aiutarmi a risolvere questo problema

Salve a tutti sono un possessore di un imac 27" i5 2.7 ghz 4 gb ram con AMD 6770M 512 mb.
Il mac mi da il  problema di spegnimento del monitor (solo monitor) con frequenza non regolare.
ho provato:
formattazione 3 volte con os x 10.8
partizione con windows 8
reset memoria pram
pulizia con compressore
poi l'ho portato all'apple store campania e mi hanno detto che era un problema della ventolina dell'hard disk e pagando 52€ ho "riparato" il mo mac.
tornato a casa il computer non solo fa lo stesso identico problema ma ho trovato anche la partizione di os x danneggiata quindo ho perso anche tutti i dati..
riportandolo all'apple store mi hanno detto che riusciranno a risalire al problema ma dopo 3 giorni sono stato chiamato e mi hanno detto che secondo i loro test il mac è perfetto e non ha dato nessun tipo di problemi.. ho portato il mac a casa della mia ragazza perchè ho pensato che potrebbe essere un problema di tensione ma anche qui da lo stesso identico problema.
voi al posto mio cosa fareste?
Hello everyone I am a holder of a imac 27 "i5 2.7 ghz 4 gb ram 512 mb with AMD 6770M.
The mac gives me the problem of turning off the monitor (monitor only) with frequency is not standardized.
I've tried:
formatting 3 times with os x 10.8
partition with windows 8
memory reset pram
cleaning with a compressor
Then I brought it to the Apple Store Campania and they told me that it was a problem of the hard drive fan and paying € 52 I "fixed" the mo mac.
came home the computer not only does the exact same problem but I found the os x partition damaged QUINDO I lost all the data ..
bringing it back to the Apple Store told me that manage to trace the problem but after 3 days I was called and told me that according to their test Mac is perfect and did not give any kind of problems .. I brought the mac to my girlfriend's house because I thought it might be a voltage problem but even here the exact same problem.
you in my place what would you do?

If you have not tried, Reset the System Management Controller (SMC)
Se non hai provato, Ripristinare la SMC)

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