Boot problem - Snow Leopard on USB flash drive

Built a fresh install of 10.6 on a USB flash drive.  The steps I took to do this were:
Installing from 10.6.3 install disc onto an external firewire drive with minimal install option.  Drive is hooked into a Mac Pro station
Booted to external drive, installed updates to get to 10.6.8.
Carbon Copy Cloaner the external firewire OS to a 32gb Patriot USB drive
Removed the external drive, then forced the station to boot to the USB drive
The behavior I get is a startup chime, then the grey Apple logo, but NO spinning gear.  No other types of signs or symbols come up for roughly 5 minutes. The system then reboots itself and chimes.  Then repeat until I hard shutdown and make it boot back to the Mac Pro's internal HDD.
I also tried installing the OS disc directly to the flash drive ( after formatting it ) but it does the same thing.  Chime - logo - no gears - reboot.
The drive itself works as I've used it for other purposes and I can see the files on there.  The access light is blinking so it appears to be trying to communicate with the computer.
Did I miss a step somewhere?

http://www.maciverse.com/install-os-x-snow-leopard-from-usb-flash-drive.html
https://discussions.apple.com/message/16276201#16276201

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