2nd display connected to iMac stays black (Thunderbolt - HDMI)

Hi everyone,
with my new iMac (purchased 2 weeks ago) I have the problem that my 2nd display will stay black after I connected it to the Thunderbolt port. The display shows the blue background for a split second, then i goes black (and stays that way). I find the following lines in the log file:
Feb 15 18:18:34 Edoras Dock[157]: kCGErrorIllegalArgument: CGSCopyDisplayUUID: Invalid display 0x003f003d
Feb 15 18:18:34 Edoras Dock[157]: uuid_callback_master: failed to retrieve UUID for display 0x003f003d (1001) (invariant failure)
Feb 15 18:18:37 Edoras Terminal[513]: kCGErrorIllegalArgument: CGSGetDisplayBounds: Invalid display 0x78c8d3f5
Feb 15 18:18:37 Edoras Terminal[513]: kCGErrorFailure: Set a breakpoint @ CGErrorBreakpoint() to catch errors as they are logged.
Feb 15 18:18:37 Edoras Terminal[513]: _NXGetScreenRect: error getting display bounds (1001)
Feb 15 18:18:37 Edoras Terminal[513]: kCGErrorIllegalArgument: CGSGetDisplayBounds: Invalid display 0x78c8d3f5
Feb 15 18:18:37 Edoras Terminal[513]: _NXGetScreenRect: error getting display bounds (1001)
Feb 15 18:18:37 Edoras Terminal[513]: kCGErrorIllegalArgument: CGSGetDisplayBounds: Invalid display 0x78c8d3f5
Feb 15 18:18:37 Edoras Terminal[513]: _NXGetScreenRect: error getting display bounds (1001)
Feb 15 18:18:37 Edoras Terminal[513]: kCGErrorIllegalArgument: CGSGetDisplayBounds: Invalid display 0x78c8d3f5
Feb 15 18:18:37 Edoras Terminal[513]: _NXGetScreenRect: error getting display bounds (1001)
Feb 15 18:18:37 Edoras Terminal[513]: kCGErrorIllegalArgument: CGSGetDisplayBounds: Invalid display 0x78c8d3f5
Feb 15 18:18:37 Edoras Terminal[513]: _NXGetScreenRect: error getting display bounds (1001)
Feb 15 18:18:37 Edoras Terminal[513]: kCGErrorIllegalArgument: CGSGetCurrentDisplayMode: Invalid display 0x78c8d3f5
Feb 15 18:18:37 Edoras Terminal[513]: kCGErrorIllegalArgument: CGSGetDisplayBounds: Invalid display 0x78c8d3f5
The display is an AOC e2343F2, with two HDMI and one VGA port. I am using a Mini-Displayport to HDMI cable to connect the display. This worked with my Mac Pro (from 2006, AMD Radeon HD5770) without a problem.
Is this a problem with the in 10.7.x included drivers?
With the new Thunderbolt port?
I tried it with 10.7.2 and 10.7.3 on the iMac and the Mac Pro. It works like a charm on the Mac Pro, but not on the iMac. Do I need to buy the overpriced Apple adapter and can't use my adapter cable anymore?

Just a theory. Looking at the log errors you showed the system cannot get the display bounds. My theory is that the display is not able to pass the EDID (extended display identification data) through a TB port. While your 5770 could handle it the TB can't. Again, it's just my theory.
Another thing to check is your Displays system preferences. See if the Display is showing in the Arrangement tab. If so click Detect Displays and also Gather Windows to bring the second monitor's Displays preferences on to your main monitor. If you get this far then set the appropriate resolution and refresh rate (if refresh rate is shown).
If there is no Displays Arrangement tab then the system doesn't even know the second monitor is connected. I don't have a solution for this problem since I don't have TB. Although the resolution is not as good you may have to try a VGA adapter for that monitor. No guarantees that will work either of course.

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1) http://cl.ly/image/1p2e3c1Z1z1C
2) http://cl.ly/image/2g0n1M1Y0t0g
3) http://cl.ly/image/2Q2P1c1J220d
4) http://cl.ly/image/113b3K2O1Z43
5) http://cl.ly/image/1q2v1s1n3w1f
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//ifraaank

Ok, I am marking this as "answered", as I have solved it myself, while I still have no clue what lead to the problem in the first place.
I've been on the phone with Apple Care today, and they were as clueless as I was and had never heard of this before.
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2nd display connected to iMac stays black (Thunderbolt - HDMI)

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