IPAD2 Magnetic On/Off Sensor not working after replacing power ribbon

I broke my digitizer so replaced it, in doing so I damaged the delicate power ribbon so replaced that too. Everything works excep the magnetic on/off that activates when yo close down the Smart Cover.
I have tried another power ribbon and again everything works (power, mute, volume) except the magnetic on/off sensor.
Does any body have any ideas what I could be doing wrong?
The part I am referring to is on ifixit ipad 2 smart cover tear down see link below but as there is no damage to the item (and I've tried a second ribbon) I really can't see what else to do.
http://www.ifixit.com/Teardown/iPad-2-Smart-Cover-Teardown/5089/1
I usually get a buzz from being able to fix things like this but this is really making me tear my hair out. Any ideas please...

I have found that the original 821-1151-A cable differs from all the replacements I have bought so far as follows:
1.  The original has the two pins of the Hall Effect device chip towards the edge of the cable connected together by the print and the connected by a track in the cable to system earth.  On the fake cable the pins are connected together but go nowhere.
2.  The two pins of the Hall chip away from from the edge of the cable are connected to separate print tracks on the original but are connected together on the fake.
3.  The multipin connector on the original cable has metal end cap reinforcements which are missing from the fake.
4.  On the original cable the system earth side of the slide switch is connected to the multipin connector and on the fake is not.
5.  The print connecting the cable to the multipin connector on one side lacks the individual contact connections of the original.
Since a Hall Device needs at least three circuit connections to function these cables are obvious fakes.

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