IMac with 10.6.6 will not boot from external with 10.4.11

My MacBook Pro with 10.6.6 will boot from that same external with 10.4.11 but the iMac does not. Why not?
1. When the iMac is starting up with the Option key depressed, the bootable 10.4.11 appears normally and can be selected. But when I click on the circle below the bootable icon, the computer freezes.
2. When I have the iMac running and try to change the startup volume via the Preferences, the bootable icons are present but are not active.
Is there a setting on the iMac I need to reset? Or, is it not possible to boot from the 10.4.11 external?
Specs:
MacBook Pro Processor - 2.16 GHz Intel Core Duo, Memory - 2 GB 667 MHz DDR2 SDRAM
iMac Processor - 3.06 GHz Intel Core i3, Memory - 4 GB 1333 MHz DDR3

The answer is dependent upon what version of OS your machines came with (and the install disks are machine/build specific) - no Mac can boot from a system older than what was supplied with the machine. So, if your MBP originally came with 10.4.x and you upgraded it since, it can still be booted from the earlier version. If your iMac came with 10.6.3 for instance, it can only be booted with 10.6.3 or later.

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    CR0: 0x000000008001003b, CR2: 0x0000000000000010, CR3: 0x0000000011803000, CR4: 0x0000000000000660
    RAX: 0x0000000000000001, RBX: 0xffffff8050e00000, RCX: 0xffffff801aa8eb00, RDX: 0xffffff80602dba38
    RSP: 0xffffff80602dbb60, RBP: 0xffffff80602dbb60, RSI: 0x0000000000000000, RDI: 0x0000000000000000
    R8:  0x0000000000000000, R9:  0x00000000000000ff, R10: 0xffffffffffffffff, R11: 0x00000000ffffffff
    R12: 0xffffff8050e00000, R13: 0x0000000000000000, R14: 0x0000000000000002, R15: 0x0000000000000000
    RFL: 0x0000000000010246, RIP: 0xffffff7f9bab8654, CS:  0x0000000000000008, SS:  0x0000000000000010
    Fault CR2: 0x0000000000000010, Error code: 0x0000000000000000, Fault CPU: 0x0

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    Sat Sep  1 17:13:12 2012
    panic(cpu 0 caller 0xffffff801a4b7b95): Kernel trap at 0xffffff7f9bab8654, type 14=page fault, registers:
    CR0: 0x000000008001003b, CR2: 0x0000000000000010, CR3: 0x0000000011803000, CR4: 0x0000000000000660
    RAX: 0x0000000000000001, RBX: 0xffffff8050e00000, RCX: 0xffffff801aa8eb00, RDX: 0xffffff80602dba38
    RSP: 0xffffff80602dbb60, RBP: 0xffffff80602dbb60, RSI: 0x0000000000000000, RDI: 0x0000000000000000
    R8:  0x0000000000000000, R9:  0x00000000000000ff, R10: 0xffffffffffffffff, R11: 0x00000000ffffffff
    R12: 0xffffff8050e00000, R13: 0x0000000000000000, R14: 0x0000000000000002, R15: 0x0000000000000000
    RFL: 0x0000000000010246, RIP: 0xffffff7f9bab8654, CS:  0x0000000000000008, SS:  0x0000000000000010
    Fault CR2: 0x0000000000000010, Error code: 0x0000000000000000, Fault CPU: 0x0
    Backtrace (CPU 0), Frame : Return Address
    0xffffff80602db800 : 0xffffff801a41d5f6
    0xffffff80602db870 : 0xffffff801a4b7b95
    0xffffff80602dba40 : 0xffffff801a4ce4ad
    0xffffff80602dba60 : 0xffffff7f9bab8654
    0xffffff80602dbb60 : 0xffffff7f9baa218c
    0xffffff80602dbbb0 : 0xffffff7f9baa20e2
    0xffffff80602dbbd0 : 0xffffff7f9ba73554
    0xffffff80602dbc00 : 0xffffff7f9aa8d470
    0xffffff80602dbc40 : 0xffffff7f9aa8d3df
    0xffffff80602dbc60 : 0xffffff7f9aa926ec
    0xffffff80602dbcf0 : 0xffffff7f9aa8af20
    0xffffff80602dbd20 : 0xffffff7f9aadacc7
    0xffffff80602dbd70 : 0xffffff801a833b9b
    0xffffff80602dbdc0 : 0xffffff801a862d57
    0xffffff80602dbe30 : 0xffffff801a497cef
    0xffffff80602dbe80 : 0xffffff801a420abd
    0xffffff80602dbeb0 : 0xffffff801a410448
    0xffffff80602dbf00 : 0xffffff801a4195fb
    0xffffff80602dbf70 : 0xffffff801a4a5ad6
    0xffffff80602dbfb0 : 0xffffff801a4ced13
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                dependency: com.apple.iokit.IOPCIFamily(2.7)[8C9E06A4-13D0-33F5-A377-9E36F0ECC229]@0xffffff 7f9aa4d000
                dependency: com.apple.iokit.IOGraphicsFamily(2.3.4)[2600903C-EEDE-321B-A023-169DC9B26EA6]@0 xffffff7f9aa81000
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