Windows 7 Install USB not recognized.

There are countless threads with problems similar to this, but endless searching and googling has gotten me nowhere.
I am on an iMac running OS X Version 10.8.3 (just upgraded to mountain lion from snow leopard 10.6 yesterday).
I have two USB sticks, one I have successfully installed the windows support software on, and the other I have successfully created a windows 7 install disk.
I am unable to even begin the windows install- no matter what I do I can't get the computer to recognize this USB as a bootable device.
I have tried going through bootcamp and can initial the windows install, but then I get the black screen "No bootable disc.. press any key to continue."
If I try restarting the computer and holding and "option" button, the USB does not show up as an option.
I have tried bootcamping this mac for MONTHS to no avail.  I really don't know what else to do. Thanks for your help.

okay, so I have the MBP Retina and I also get the "No bootable disc.. press any key to continue." message. Funny thing is, it worked perfectly fine before using the exact same iso file and usb. I wanted to install windows a-new and now get this error, no matter what I do. When I installed Windows for the first time I still had ML 10.8.0 or 10.8.1. No with 10.8.3 it won't work anymore. I have already played around with the info.plist file, without any results.
any ideas?!

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