Hi, thanks for the advice alphanumeric, you were correct. For anyone having the same problem (partial lighting up of sensehat with red and green LEDs only, no successful boot) then it is likely that the ribbon cable has reversed the top and bottom layer of pins. The solution, which was not immediate...

Hi Does anyone have any advice on how to get the Sense HAT working with a GPIO extension cable? I bought an extension from Pimoroni, and a 40 pin male-male IDE header from eBay. The HAT works perfectly on my B+ when plugged straight in. Using the extension cable, only the green and red LEDs light up...