Hi John,Thank you for using just answer my name is Carl and I will help with your question.I am sorry to hear you are having trouble it could be one of two things the hard drive is failing or the enclosure it is in has failed. I would suggest taking the enclosure to pieces and removing the hard drive. The hard drive will be a standard hard drive that would fit and work inside a desktop pc if you have a pc available I would put the hard drive in the pc for testing and data recovery if needed. If the hard drive powers up in the pc the enclosure is likely to be the problem most of the time it is the enclosure that fails. If the hard drive is failing it will continue to click inside the pc. If the hard drive clicks when inside the pc and you need data recovered of the hard drive it is important not to power the hard drive up again because every time it is powered up it could be causing more damage.If you don't have a pc available this is a good way to test a hard drive it makes it usb.http://www.ebay.co.uk/itm/USB-2-0-TO-SATA-IDE-CABLE-FOR-HDD-W-POWER-ADAPTER-A-/320705061202?pt=UK_Computing_Drive_Cables_Adapters&hash=item4aab82e152
There are no obvious fixings on the case, so how does it come apart?
If there are no screws it is likely to be two halves clipped together. I normally get a guitar plectrum or an old credit card and use that as a pry to open the case. Check under rubber feet for screws
No rubber feet.
The assembly diagram is unhelpful.
I shall prise as carefully as I can !
if you use a credit card you should get a feel for how it is clipped together. credit cards do a really good job at unclipping plastic clips without damaging them.
The covers came off with persuasion!
The rest of disassembly to the drive unit was easy.
The HDD has a connector I have not seen before so it will not fit in any PC I have.
My riend might be able to check the drive for me, but that may take a week.
So that is as far as I can get tonight.
I will return when I have news.
Thanks so far.