Fedora 12 Alpha RC1 - live iso would not boot properly as liveusb

[Mike Cloaked]

I downloaded the latest staged iso file for Fedora 12 Alpha RC1 livecd - and
used the method 
dd if=path-to-iso of=/dev/sdb bs=8M to create a bootable usbkey for the
livecd.
the boot began and the kms worked fine but at the end of the period when the
Fedora icon filled with white instead of giving a live desktop it failed to
load X at all and gave a bash prompt saying that the root filesystem could
not be found. I am not sure how to get any usable log info from the system.

This is a Dell Dimension 2400 with an Nvidia graphics card and for which F10
has been running just fine.

I did not see any place on the test matrix for F12 alpha for reporting this
situation - has anyone else seen symptoms like this?
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