cyberteque, did you see the notes about pull-up resistors in the older posts on this thread?
This device is SMBus protocol, not I2C so that is one reason, I assume, that many are having trouble.
I am a beginner so be careful with my advice ; ) but one thing I have recently found is here:
maybe it will help. I still like the idea of setting up this device to output PWM instead of communicating on the SMBus.. however I will have to first figure out how to make it do that.