Will not open leopard on external hard drive

I am running Lion on an iMac 27" 4 core and I am trying to open on an external hard drive loaded with Sow leopard but the screen shows the apple icon and just sits there with no loading spinner. I also have a 13" macbook pro and have no trouble in opening the same external disk with snow leopard. The imac also does not like opening from the dvd.

If by opening you really mean booting, then most likely it can't handle the differences between the iMac and the MBP. There are differences with machine-specific builds. See http://support.apple.com/kb/HT2681 and http://support.apple.com/kb/HT2186 for details.

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