i had the exact same problem with my a3000d
a while ago. the connection between the
daughterboard and the mobo was bad. i
removed all the oxide and dirt and made sure
that the daughterboard sat properly and voila!
it worked... so, my advice to you is to try
to remove the daughterboard and put it back
again (and perhaps repeat a couple of times)
and if it suddenly (hopefully) works then
you have found your problem..... oxide...
