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Due to the incredibly complex construction of a hard drive, you won't be able to fix your own drive to the point of being able to retrieve the data stored on it unless you have an advanced background in electronics. For this reason, you should hand your hard drive over to a professional repair service.  Attempting to fix a dead hard drive will only lessen the chances of a professional being able to repair it. Even replacing the PCB board is an advanced exercise that requires knowledge of how to solder circuitry and purchase exact part replacements. True hard drive recovery entails the use of clean rooms, specialized equipment, and highly trained personnel. As such, you'll likely spend over a thousand dollars getting your hard drive's information back. You can usually find drive recovery services through your local tech outlet, but a couple of outstanding options include the following:   Best Buy - Best Buy's "Geek Squad" branch handles data recovery. You can expect to pay anywhere from $200 to a little under $1500, depending on the severity of the hard drive's damage.   Drive Savers - Drive Savers is a 24/7 customer service-based data recovery company with 30 years of experience. In addition to computer hard disk recovery, they can also recover smart phone and camera hard drives. Each time someone opens your hard drive and tries to fix it, the probability of it actually getting fixed decreases. This is because opening your hard drive renders it susceptible to things like dust, static electricity, and other environmental hazards. To minimize the risk, you should avoid asking for multiple consultations from different companies. To be sure of the company's competence, inquire what kinds of data recovery tools they use. If they use PC3K or DeepSpar, that is a good sign.
Understand that hard drive recovery is a job for professionals. Expect to pay a lot of money for the repair. Find the repair company that best suits your needs. Pick a company and stick with it.