Created windows 7 install flash drive in Mountain Lion OS, but, now how to install it?

Hi there.
I'm sorry guys, I don't know if someone can help me here... I hope so...
Well, I bought a MacBook Pro 15'' retina display, with Mountain Lion OS, and Bootcamp 5.0.
1. I went to Disk Utilities / Bootcamp Assistant, and I did manage to create a bootable flash drive with windows 7 in it (since my Macbook Pro doesn't have any cd/dvd drive, I choose to install it through a flash drive).
2. then, I returned to Disk Utilities / Bootcamp Assistant, and I choose to install windows 7 through the flash drive (3rd option of the menu).
3. It lead me to a menu where I did created the windows partition and,
4. I just pressed the "install windows" option, at the bottom.
The PROBLEM is that I just get a black screen with a "No bootable device -- insert boot disk and press any key" message in it.
So, why didn't it recognized the flash drive? How can I get out of here and do it properly?
Thank you very much, if someone can be so kind and help me with this...
RFCV

rfcv wrote:
Vinmar:
I switched it off, and on again.
And, while was starting up I kept the Option key pressed.
But, now it simply doesn't start! O_O
I just get a grey screen with nothing...
Seems like the computer doesn't like your USB flash drive or the .iso to USB creation process didn't work.
I guess if all else fails, you could pick up an external USB optical drive and use the Windows DVD to complete the install. I'm sure it will come in handy for other things, too.

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Created windows 7 install flash drive in Mountain Lion OS, but, now how to install it?

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