The machine worked just fine last night with a new power brick. I got 8 1/2 hours of sleep in my own bed and caught up from a week of jet lag. 0.1 AHI. Back to normal.
I'll watch the machine carefully for a few nights and give the DOA power brick to my DME on Monday and get a replacement.
It's nice to hear that your machine is ok.......and also good to get your feedback so we know that the power converter is something to check first if we ever suffer a similar problem.
Keep on truckin.
Geoff, it would be good to know how you sourced a new adapter in case anyone else runs across this problem.