When you get all 0's, it usually means one of two things.

1) The SDA,SCL pins still have the analog mode enabled.

2) There aren't any pull-ups, or they pull-down.

If you have a voltmeter, check the voltage on the SDA,SCL pins.
They should be above 4V when no data is being transfered.

But I'm betting on analog mode.
<br>