MiniDisplay Port (Thunderbolt MacbookPro) to DisplayPort Dell U2410m don't work! The signal only comes as YPbPr, no RGB and bad quality. Is there any solution?

I want to connect my new MacBook Pro via DisplayPort to a Dell U2410m monitor.
But the signal only comes as YPbPr, no RGB and bad quality. Is there any solution?
It works with the mini display port to DVI adapter from Apple but I want to use the DisplayPort.

J~
cmelbourne91 was suggesting HDMI because many of the MDP/Thunderbolt to DVI adapters come with an additional DVI to HDMI (not Apple's) and you likely won't find any MDP to HDMI becuase of something weird with one of the Apple or HDMI related patents and the type of cable/jack/plug required for it.
As for my computer (15" MBP mid 2010), it almost seems as if I have your problem but intermittently. When connected to an external monitor or projector, the thing will project just fine, but then after some time (and no movement of the computer, cables, or screen) the connection quits. Sometimes it comes back on, sometimes it does not, but it basically registers as if there is no external display.
Any additional info on this?

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MiniDisplay Port (Thunderbolt MacbookPro) to DisplayPort Dell U2410m don't work! The signal only comes as YPbPr, no RGB and bad quality. Is there any solution?

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