Hi Kieran,
The YouTube videos that I've seen covering the Hudl2 tend to skip the actuall opening of the device, but this video gives you an idea of how the rear comes apart from the rest of the device. I'd recommend using a plastic opening tool to work your way around the seam. Also, since nobody else has created a guide for the Hudl2, feel free to document the process and create your own guide.
I hope this helps. Hopefully, it is just a loose cable.
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