I'm just getting started with the Pi and indeed i2C, I have bought the "IO Pi Plus", soldered on the connections and mounted it on top of my Pi2+,

followed the instructions here (https://www.abelectronics.co.uk/kb/article/23/python-library-and-demos and here https://www.abelectronics.co.uk/kb/article/1/i2c-part-2---enabling-i-c-on-the-raspberry-pi) and now with the baord connected running:
pi@seeburg:~ $ sudo i2cdetect -y 1 0 1 2 3 4 5 6 7 8 9 a b c d e f00: -- -- -- -- -- -- -- -- 10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 70: -- -- -- -- -- -- -- --
I have enabled i2c on the pi... not sure how to debug it.
I have checked with my meter that the board has power from 5v -> gnd on both buses and the other terminals...
Wondered if there was anything obvious i should try?
As an aside - i added a power button on teh GPIO pins on the GPIO extension pins on the IO Pi Plus which appears to work great - so feel the board is getting power...
Any ideas?