I have the same problem.
My Pismo won't recharge any
What I did was:
I went to the closest Apple Store (1.5 hours away) and they tested it out with their batteries and power adaptor. The same problem happened: no charge.
They sent it away for a PMU replacement, and when they received it after the replacement, they tried their power adaptor, and it recharged my dead battery. I then tried recharging it using my power adaptor, and it wouldn't charge.
I just ordered a new power adaptor, and will hopefully see if the problem was with my current power adaptor, and perhaps a combination with a PMU problem. I just hope that since I'm still using my current power adaptor, that it won't damage the PMU again, if it did in the first place.
I would recommend trying another yo-yo power adaptor, since you already replaced your PMU. Good luck.