So hopefully you've figured it out by now but here are some diagnostic steps:
1) No power = no fluid pressure. This comes from low fluid (really low), screwed pump, or a busted pressure regulator circuit in the valve body (loose valve body, loose pickup?). Could be a screwed converter as well that is not allowing input power to flow to the input shaft. That comes from a fried sprag/one-way in the converter.
2) No forward = no forward clutch. You don't have forward or reverse so this is unlikely.
3) No reverse = no rev-high clutch. This would only show up in reverse or high. Again, unlikely you have two problems stacked up so it's back to #1 above.
I hope some of the pros help out because this has to be very frustrating.