External display acting strange in Lion?

I'm having a problem i can't work around. I have a mid 2010 macbook pro, i5 2,53ghz running Mac OS X Lion 10.7.2. I have an apple mini display to DVI adapter and a Fujitsu Siemens 27" monitor with a native resolution of 1920x1200 with HDMI, DVI and VGA input. The monitor works just great on VGA and on DVI, no problems at all and at the correct resolution.
I now bought a DVI to HDMI cable and inserted the HDMI in the monitor and the DVI in de minidisplay port and it ONLY works on 1080i. ALL other resolutions result in a flickering image of the screen filled with pixels in all kinda colors and then a véry short image of the actual desktop in bad quality. I thought it was the cable so i tested it on a windows based laptop and it worked fine.
!!! The most crazy thing is; when i boot into Windows 7 on Boot Camp, the setup works GREAT at the native resolution of 1920x1200. So the cable isnt broken, the minidisplay to DVI adapter isn't broken and the monitor isn't broken because it just works in bootcamp. As soon as i reboot into mac the same problem occurs... Any ideas?

To fix your issue is too complicated and lengthy to go into all of it here as it sounds like a hardware issue, it will require the services of person very familiar and experienced with Mac's to first recover your data and then restore OS X back to a functional state which may or may not require new hardware/software installed.
If your under warranty or AppleCare, take it in for service.
You can also hire the services of a local Mac computer support technician experienced in these matters.
Have them look at your Wifi, RAM amount, extra storage and computer backup proceedures in the process.
Good Luck.

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