How to boot from Windows 7 installer USB-thumbdrive?

I have created a Windows 7 installer USB-thumbdrive from .ISO image using Boot Camp Assistant.
What I can't figure out how to make my Mac Mini boot from USB to start the Windows 7 installer. The USB-thumbdrive does not show up in the boot menu when pressing ALT during startup (I'm using generic PC keyboard) nor is it available for selection in System Settings --> System --> Startup Disk.
My computer is early 2009 Mac Mini, Intel Core 2 Duo, 4Gb RAM, OS X Mountain Lion 10.8.4.

Anyone?
Additional question: is a 2009 Mac Mini able to boot from USB to begin with?
The situation has become particular annoying, because my Mac Mini's optical drive appears to be damaged and therefor I'm not able to boot from any kind of Windows install DVD.

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