I hate being without internet.. I'm such a geek these days..
If you can, print out the troubleshooting pages and use those. One area to look at specifically is to be sure to go in and MANUALLY set your RAM timings.. Don't use the auto feature. Get the model number off of you sticks and go to the manufacturing website and see where they say to run them for best performance.
If I understand your posts correctly, everything is working with the m-audio and not with MOTU.. I would say it's the MOTU. I've only ever had one MOTU product, and 8 channel mic pre that I bought from Ben Sneesby at Beez Neez mics.. He called it a boat anchor that barely sufficed for him to test some mics with.. I had it for about a week then sold it without ever plugging it in.. (made about $50 on the deal too
).
Ask around your area and see if you can find a presonus or something similar to try..
One last thing.. MAKE SURE that you have downloaded and installed the digi audio drivers for PT9.
Hope you get it going.