Typically the reason for circuit board failure is some sort of electrical or mechanical damage to board’s microchips or connectors – these components can be damaged by electrical surge from a faulty power supply, wrong connection attempt, electrostatic discharge, accidental mechanical impact or short circuit, water and fire damage. The consequences might be quite numerous but most commonly the drive is not spinning, sometimes you can feel a smell of fried electronics and actually see burned or mechanically damaged or missing components. Data recovery from hard drives affected by circuit board failure is usually performed by replacing a circuit board with compatible one from a donor drive, donor’s flash ROM must be reprogrammed using special tools to exactly match the original’s. Sometimes this is not enough – electrical damage reaches read-write heads preamplifier microchip located inside the drive, in such cases head assembly replacement is needed, clean room required. Our success rate for such recovery jobs is at least 95%.