27' iMac wont detect Display

Hey folks,
I'm using the 27'' iMac Intel i5 and i have the following issue
it wont detect my dell S2009Wb display, I bought the original adapter from apple from the mini display port to dvi.
any suggestions? or experiences please help!
thanks guys!

Whew, I think I'd call Apple & ask to speak to customer relations, if what you say is true about the store/genii it sounds flat out wrong.
Does it start & show anything if you hold Option or alt key at startup?
How about the SHIFT key?
Does it still boot from the Install Disc?

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Macbook Pro with Retina wont detect monitor on mini display port to dual-link dvi adapter

So after reading Jeff Atwood's post, I decided to jump and give it a shot. So this week I got my monitor in from Korea, and I already had my Apple mini display port to dual-link dvi adapter, hooked everything up - and nothing. Monitor doesnt show a signal, and no display shows up in user preferences.
To verify the monitor actually works, i plugged it into my windows box - and boom, right away there it is in all its glory. So I called apple support, after spending about an hour going through the "are you sure its plugged in stuff", the tech finally admitted to being stumped and blamed the adapter. Not to be deterred, I then went to my local apple store and talked them into trying their adapter to rule out the adapter - regardless of the adapter, the mbp wont detect the monitor.
Just for fun, i tried my old single mini displayport to single dvi, the monitor is recognized, but that obviously cant drive the right resolution, so i just get a backlight. Same deal when i try the hdmi port with a hdmi to dual-link dvi adapter on the end of it. Also tried display port to the same hdmi with adapter on it (the joys of working in a dev shop - cables to test everywhere)
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install gfxCardStatus to ensure i am on the nvidia (discrete) and not the internal card
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I bought the monoprice adapter wondering if it was just the apple adapter since the apple adapter has been panned, no love from it either
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I have two other adapters coming in to test with in a day or two - maybe one of those will be magic, but at this point i kinda think its software on the mac. My Spec:
I am running Mountain Lion with all the latest updates
New MBP with Retina (2.6g processor, 16gig ram, nvidia video card)
Here is the ebay link to the monitor
Now the other weird thing is pretty much universally these auctions say the monitors cant be run on a laptop - which makes no sense to me, because its just a connection, if the video card is strong enough (which my machine better be) it shouldnt matter the source. The listing mentions its a "by-pass" monitor, which is something I and google have never heard of.
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Magic was, I have to have the adpter plugged into the mac, let it recognize all with the monitor powered off.
then power on the monitor, and boom gloriousness
For future generations, setup that works:
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Back in November 2008 i bought an Intel iMac 20". Last friday I bought a new iMac 27". I want to use the 20" one as a second screen. Not as an external display, but be able to see my screen on the 2 computer at the same time. How can I achieve that? I've read on google that people were able to do it, but they never say how (like someone would watch their TV on the iMac)... I've tried screenrecycler, but it doesnt work on 64bits and i've read that over the internet there's always a lag, which is annoying.
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Hey, I just got my 27" iMac last week and can verify that this works, as of a few minutes ago. I used the cable that converts from DisplayPort (the end that plugs into the iMac) and the mini DisplayPort (the end that connects to the MacBook Pro.
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27' iMac wont detect Display

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