Could it be a knackered SATA controller and not a faulty HDD?
This is well know fault that you could have found out about with just a modicum of research on this Forum. It isn’t the SATA controller that has failed but another component on the motherboard (some reports suggest a resistor). Humax were offering a fixed price repair for the problem at a cost of £26 but this has now been replaced by an offer of refurbished box for £55. Talk to Humax support; slightly tricky as you have opened the box.