Trying to boot iMac in 64 bit mode, but not successful

Hello:
I am trying to boot my iMac in 64 bit mode. I have done some research and I am getting conflicting answers. Most of what I am finding says:
1. Must have an Intel Core 2 Duo: I do
2. My efi must be 64: It is
3. Must have Snow Leopard installed: I am running 10.6.2
I am running what is described as an iMac 7.1, which in theory would not be allowed to run in 64 bit mode. Also, starting up while holding the 6 and 4 keys does not force my machine to start up in 64 bit.
Any ideas/explanations as to what might be going on?
Thanks in advance.
Message was edited by: Coqui-

I don't know exactly what model imac 7.1 is but I suggest you check here on how to identify your imac
http://support.apple.com/kb/HT1758
according to this
http://support.apple.com/kb/HT3770
you need imac early 2008 or later to be able to boot into 64-bit mode. but as WBW already mentioned there is no reason to actually do it unless you have loads of RAM and some RAM hungry 64-bit apps optimized to use loads of RAM.

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