for future reference a backup solution would be cheaper than what you have been doing and what you might have to do to get your data back *if you can. Personaly i just burn dvd’s for stuff at least once a year or more and in case of a problem i won’t lose everything if i start over. although i would never burn a dvd with out checking the dvd with special tools though, reported success don’t usually mean anything.
anyway use the search function here for drive board / pcb repair and go to the links people are always posting… sorry i forget what it is but there is one popular site you should go to donordriverepair.com or something like that… that will help get you on the right path for parts OR paid pro help / service.
i wish you the best of luck and i am sorry to hear about your trouble, we all here know what your goin though 
