My MacBook doesn't detect a bootable ML USB.

I have made a bootable USB to do a clean install of Mountain Lion on my 3yr old MacBook Pro.
However when I start my MacBook holding down the 'Option' key the USB doesn't appar as a choice....Only the HD choices appear.
I have an old Mac Mini....When I hold the 'Option' key when starting the Mac Mini I see this USB bootable drive as an available option.
The USB I'm using is an 8GB Lexar.

I'm having the same problem connecting to a vista laptop with my new aluminum macbook. The frustrating thing is that the vista machine has zero problems connecting to the mac. I have spent 3 hours today googling for an answer and tried everything I cam across with no luck. I won't list it all out here, but occasionally, I can see the laptop in the network when browsing, but not always. If I try to connect to the server either by double-clicking on the occasionally visible vista machine, doing smb://ip or smb://name both time out and I eventually get the -36 error. I've turned on sharing on vista, given everyone full rights, made sure that the machine names and shares didn't have hyphens or spaces, turned off the firewall, made sure they both are on the same workgroup and set some obscure registry setting on vista (lnmp/ lsa related, I believe). I'm very frustrated. I want to use the windows machine as a file server for my mac, not the other way around. Help!

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