Mini DisplayPort stopped working only for DVI connection

I have been using my iMac with an external 22" Samsung display, using a MiniDP>DVI adapter. Yesterday I disconnected this configuration in order to connect the iMac to a 46" TV to watch a film, using a MiniDP>HDMI cable. Worked OK. When I reconnected the iMac to the 22" display using the same MiniDP>DVI adapter, the iMac wouldn't do the work anymore, as if I hadn't connected the MiniDP>DVI adapter at all.
I have already tried the following steps:
1. Tested reconnecting the 46" TV and even the 22" external display using MiniDP>HDMI cable: it works (so it seems that the MiniDP port on the iMac is functional);
2. Tested using the MiniDP>DVI adapter in a different iMac with the same 22" display, worked ok (so the problem is neither in the MiniDP>DVI adapter or the 22" display);
The only thing I can think of is that the MiniDP port broke in a way that it can only let HDMI signal out, but not DVI signal. Weird, isn't it? Anybody has any clue on a way to fix it without sending the iMac to tech support? Could it be a software/OS problem?
Thanks in advance.
PS.: you may be asking yourself why won't I connect the iMac to the 22" display using the MiniDP>HDMI cable, since it works; the problem is, with HDMI the image looks crappy, the colors are washed out, fonts are hard to read. I have searched for this problem on the web and the Apple Support Communities, it seems to be a common complaint and without solution. So, in order to have a perfect image on my external display again, I must make it work through the DVI port.

Reset SMC and PRAM
Intel-based Macs: Resetting the System Management Controller (SMC)
About NVRAM and PRAM
If you boot up with on the DP monitor connected does anything show on the monitor?
Last
If still problem, make an appointment at the Genius Bar of an Apple store since it appears you have a hardware problem.
Apple Retail Store - Genius Bar

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