How do I install windows 7 from a USB on start up?

I hold alt when I hear the start up sound and select the usb. As soon as I hit enter, the cursor freezes and it remains on this screen for a long time. Is there a way around this?
I tried to install it through bootcamp assistant, but it doesn't give me the option to install it, only partition the drive.
Sorry about the photo being upside down. I couldn't do anything about it.

Will the option appear if I put a windows 7 installation disc into the dvd drive?
I followed these steps that would allow me to boot from a USB with my version, so I do see the option there.. is it still not possible?
Lior’s solution to no-bootup option for your USB drive Windows installation disk in Bootcamp Assistant (thanks Lior!):
If you have only 2 options in the boot camp assistant, or if bootcamp doesn’t recognize the windows installer disk when its on a bootable usb, it’s because bootcamp doesn’t recognize your macbook as a model that should install windows from a USB, its actually quite easy to fix, just follow these simple steps:
1. go to Applications>Utilities> right click on boot camp and click Show Package Conents, you’ll find a folder inside called Contents (If i remember correctly, not on my Macbook atm). Inside that folder exists a file called info.plist.
2. Right click on the folder containing the file > get info > change permissions so any user can read & write. Do the same for the file itself (right click > get info…).
3. Right click on info.plist and choose Open with > Text Edit.
4. at the end of the document theres a list of strings that contain different versions of Mac computers, the list is titled something like: “USB boot Versions”, add your Mac’s version to the string list ( MB40 ) if your version is Macbook 4,1 (you can see this by clicking on the System information App in the Utilities folder).
5. save the file and change back the permissions on the file and folder.
Now open boot camp and you should see the option to create a Windows 7 installler on a USB, and also bootcamp will look for a windows installation on any USB’s after you partition the hard drive.

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I fix that issue with >> rEFIt <<, that suddenly makes it possible for the Mac to see the USB drive, and partitions.
Which was very strange since I could use an extern HD with the whole installation to start up wipe the whole disk, and then use my extern drive with partitions to install Snow Leopard and get everything as before with timemachine. Very smart with timemachine, but very lucky that I have a extern drive that runs the whole system and that I made the partitionsdrive before. DVD-drives are the past!
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I then downloaded the Windows DVD / USB Tool, reformatted a USB drive as Master Boot Partition, MS-Dos Fat partition, then after lots of struggling got Vmware, windows to recognise the USB drive. And installed the windows software on the USB drive, as all the walkthroughs recommend.
Then I tried for "fun"! to just install windows form the extern USB drive, and with rEFIt it will see the drive and start to do something, but then when it starts to boot, the screen just turns into black and nothing happens, and you can see the drive does NOTHING. (I think it is because I only have 1 USB drive and the Extern DVD drive does not get enough power, but again the mac refuse to see the USB drive unless it is a Snow Leopard installation USB-drive!
Well trying to install Windows Ultimate 64 Bit, which worked great in vmware, because that program installed from the .ISO file that I had on the desktop, but trying with Boot Camp did not get anywhere, what kind of **** program is this boot camp anyway!?, but then I try the new USB disk with windows made from windows, thorugh rEFIt, it sees the disk and then starts and then I get this ERROR:
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There are strings in the pliist file to add other Macs so that you can use some USB-DVD drives.
This is 5 page thread, so a little more 'meat' to it:
https://discussions.apple.com/thread/3410900?start=60&tstart=0
And on PC booting Windows from a USB DVD to do the install is usually a piece of cake, sometimes you just need to specify that USB in the BIOS boot order and sometimes select via F12 (or another Fkey) and that is it.
What you have here seems to be everything and everyone is excluded unless there is a mac-model device ID string that specifies yes. An unnecessary hurdle.

How can I install Windows 7 by USB? MacBook late 2008 10.6.8 Boot Camp 3.0.4

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I have tried software update and no luck. I think my Boot Camp on Mac 3.0.4 is not showing me the right option on creating a USB installation. It asks me to load Windows 7 CD when I don't have it, I bought it online... Every download I tried from Apple is .exe and I am losing hope on this one...

You can only install Windows from a USB with one of these Macs:
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Installing from a flash drive: I burned the image to a USB flash drive. The windows installer does not start. The the disk is not recognized when I hold option/alt at startup.
Do I have to do something to enable USB startup? Is there another installation method available?
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On MBPs that came with built-in Optical drives, BC Assistant modifies the NVRAM settings and sets the boot option to be the Optical drive. Removing the Optical drive breaks this logic and causes a lot of problems. Modifying the Bootcamp info.plist allows USB creation workaround, but does not allow the NVRAM modification. This is derived by BCA using the Model Identifier in System Profiler.
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Welcome to Apple Support Communities
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Thanks for using Apple Support Communities.
Please ensure you are following the Boot Camp installation guide, as you should be selecting the partition named "BOOTCAMP" when you are at the Windows installer screen. See page 6 of the following PDF:
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There are strings in the pliist file to add other Macs so that you can use some USB-DVD drives.
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How do I install windows 7 from a USB on start up?

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