External startup disks will not start with my new iMac

My external devices which are startup disks will not start when connected to my iMac, although it appears in the bootable drive selections after the chime sound, using the option (Alt) key. I get the bootable drive selections and when selecting it all I get is a gray screen with the apple logo and that is it. No matter how long I wait the start up does not happen. I am sure that the external device is not damaged because there is no problem to use it as a startup device when connected to my MacBook Pro.
Otherwise the devices work as they should. If I connect them to my iMac then they will appear on the desktop, etc. The only thing which does not work is that they cannot be used as startup disks, even though they work fine as startup disks if connected to my MacBook Pro.

Based on your description it is very hard to tell what is going on.
You appear to have an i7 iMac. That model was delivered with Snow Leopard (10.6.x).
My guess is that your external disks may have a version of OS X that predates the version supplied with your new iMac. You cannot run an earlier version of OS X than what was delivered with your Mac.

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