Mac Pro not Detecting Bootable USB Drive to Install Snow Leopard 10.6

Hi
I have to Mac Pro 2 x 2.8 GHz Intel Xeon. I have been running Leopard on them. I wish to install snow leopard, so i took out my USB HDD where I have made a Bootable Partition with snow leopard. I have used this in the past on all my machines to install snow leopard. Now when I try to install Snow Leopard from this on my mac pro, it does not detect in the "Option Boot" start up menu, it only shows my leopard disk. If I got to start up disk in system preference, then it shows my Snow Leopard disk, but when i select that as start up, it still boots to my Leopard..
Since I am doing a fresh Install , I have another HDD installed, formatted for snow leopard. When I launch snow leopard installer from Leopard and select install in the new drive, it does some installation , but when restarting  it goes to my leopard again.
This is the case on both the Mac Pro;s, but not on my laptops, I tried on my air and my macbook pro, and my friends mac book pro, it instantly boots up to the usb drive with snow leopard.
So is there anything im missing ? Or is there something wrong with my Mac Pro's?
I dont have the snow leopard DVD, else I would have tried that too..
Please advice asap!!
Thanks
Sa1

Hey
Thanks for the reply!
I have two USB HDD, with the copy from snow leopard dvd, and both are formatted in GUID, they work fine on my laptops and even the old mac mini, just not working on two identical Mac Pros.. Its very strange, as it keeps booting to leopard, and if I remove leopard Disk, and just put the new one and connect the USB dive, its shows a folder with a "?" mark sign!
And the USB just works fine after its booted to leopard, it even starts installing snow leopard to the disk i assign, but it does not complete the installation as it boots to main leopard drive..
I have tried to reset PRAM on both machine, I have changed usb slot..
I dont know what to do!

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