Trying to run 2 external monitors with HDMI splitter

I'm trying to run two external monitors from my iMac using an HDMI splitter but I can only get signal to one. I've read a lot of forums saying it is not possible to run two monitors from an iMac but the two monitors can be mirrored, in fact, I would be prefer it if they were.
I've got the mini-DVI to HDMI cable running to an HDMI splitter, one end going to my 52'' Sharp Aquos tv and the other to my 21" BenQ monitor in the kitchen.
I would just like to be able to have both monitors playing the same video at the sametime, I don't understand why this would not be possible.
I'm at work so I don't have the exact specifications but I recently purchased my iMac and have the i7 processor and the Radeon 5750 graphics card so I know it's not a hardware limitation
What am I doing wrong?

I will reply to my own question just because I figured out the answer.
The Larger display has to be set to the maximum settings of the smaller display
For example: My sharp aquos has to be set to 720p BEFORE plugging in the BenQ which will not do 1080p
If you try to plug in the benQ before setting the Aquos to 720p, it will not work and you will not be able to change it after the fact.
May seem simple now, but boy did that drive me crazy for a while.

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