Hi Spagy,
I know very little about Cams ( and what I do know is from all the threads on this site) but it doesn't take Einstein to work out that your cam has gone "off".
So you are saying that the G2 will work in the embedded card slots of your receivers YES?? If so then the card and your boxes are all good, which leaves the issue with your cam. I don't know why your cam has failed but at a guess I would say that the firmware/programming has changed so I would suggest getting it flashed again by somebody reputable. There are a few guys on this site who can do it if you can't.
Hope this helps.
Cheers
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