My 2006 24" iMac (6.1) no longer recognizes Tiger 10.4

As I remember, in 2006 this imac had Tiger 10.4 installed when new. Since then, I've done a clean install to Snow Lion 10.6.8. Now when I try to reinstall Tiger I see a dialog box that tells me this computer does not support Tiger! Does anyone know why and how to go back to Tiger?

Thank you Klaus, I suspected as much but wasn't sure. What I want to do is load Tiger onto an external HD so I can see Tiger as I talk my sister through a problem. Besides wiping the boot HD, is there a way to put Tiger on an external drive? Guessing "No"...

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