Can't Start from Install disk or external Hard Drive

I've installed an operating system on a external WD 120Gb hard drive. I am unable to start up from the WD Hard Drive or the Snow Leopard install disk, either by selection them from the Startup disk or by pressing 'OPTION' at startup. Every time one of these is selected, the computer starts from the MacBook internal hard Drive.
I have installed the operating system on an Iomega 1 Tb external and it doesn't show up on the Startup disk or when I start using the option key.
I have reinstalled the operating system on both the MacBook Pro Hard drive and he 120Gb portable.
I have a 2Gb SimpleTech Dual Pro Drive, which I can see and start up by, using the Option key at system boot.
I have a 500Gb Iomega I am using for my TIme Machine.
I can't figure why I am unable to start up using the Software DVD.

Thanks for the tip. In the end I combined bits and pieces of what I had read on other peope's messages, what worked for me was putting the frozen computer to sleep with the power button and then waking it up with both the mouse and the C key held down at the same time. Individually nothing happened but with both the CD popped out.
Thanks again,
Jason

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Can't Start from Install disk or external Hard Drive

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