External Optical Drive not working with iMac

I have a memorex external drive that I have been using to install Windows 7 with boot camp and have successfully used it on 2 mac-mini's. I am not trying to install Windows 7 boot camp on an iMac that has a broken internal optical drive but the external will not run.
I have tried:
- Startup Utility: Can see the external in there.
- External shows up on desktop with Windows 7
- External shows up in disk utility
- Windows shows up in startup menu with holding down Option.
I see iMac SSD Drive, Recovery HD Drive , Windows CD , EFI Boot cd as options.
If I select Windows it takes me to a black screen that says it doesnt see a boot CD clicking on EFI boot does nothing.
Anyone have any possible solutions into getting this to work?

Valen85 wrote:
I have a memorex external drive that I have been using to install Windows 7 with boot camp and have successfully used it on 2 mac-mini's.
Mac Minis without built-in Optical drives behave differently than iMacs with built-in drives for boot ability,
I am not trying to install Windows 7 boot camp on an iMac that has a broken internal optical drive but the external will not run.
I see iMac SSD Drive, Recovery HD Drive , Windows CD , EFI Boot cd as options.
If I select Windows it takes me to a black screen that says it doesnt see a boot CD clicking on EFI boot does nothing.
This is confusing. If you have the external Optical Drive (Memorex) connected via USB to the iMac and insert a Windows 7+ DVD in it, the Apple Bootmanager will see OSX, Recovery HD, Windows (if already installed on the iMac's internal drive) and possibly Windows and EFI boot from the DVD.
The Windows and EFI Boot will not work if you try to boot the iMac from the external. Test this from the internal Optical drive as well. If your iMac is a UEFI Mac (2013+) it will let you boot from the DVD directly (without Bootcamp).
Bootcamp Assistant will refuse to let you use the external Optical drive, if you try use it to install Windows. BCA only works with internal Optical drives as far as Windows installation is concerned, on Macs that have a built-in optical drive. The exceptions to this rule are 2012 Macs and some 2011 models.

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xamdu,
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