My Nokia N900 is not recognizing my "Argard M10" bluetooth headset. I've used this headset with my Nokia E71 with no problem.

I've also tried pairing it with a Plantronic discovery headset, it will sometimes work and most of the time it disconnects. the receiving end of the call can not hear me even when I speak loudly.

It also does not pair with my Panasonic Link to Cell Convergence Solution model #KX-TH1212. Which again paired with my Nokia E71 with no problem.
I'm very frustrated. I can't get Nokia to respond to this problem.