I finally learned how to check my downloaded disk on a machine with ubuntu. Indications are that everything is OK.
Machine is Asus M2NPV-VM motherboard, AMD Athlon X2 4600, 2 gigs of RAM, 40gig and 150gig SATA Hard drives, on board nVidea 6300 video, IDE DVD RW drive, no tuner card yet.
When attempting to load Mythbuntu AMD64 build in the live environment, the load proceeds past the completion of the progress bar to a blank screen with only a mouse pointer (arrow), but no further.
Attempting to install yields the same, except a, X as the mouse pointer. Both pointers respond to mouse movements, but no further loading occurs.
Anybody have any ideas?