Hey Guy's! I feel for you I've had the same problem with my DM-24. But I tried all the site and search high and low with no results. So I just said screw it and bought a VGA interface. I think it cost me $300.00 US...but am glad I did. I love the Dm-24 and have the screen on a 19" Monitor...and it's Freaking Great.
If your fed-up like I was you can check it out for your self.
Here it is — 2Seemy: Breathe new life into your Home Studio —
I'm not affiliated with them...There in Europe I'm in Canada. They ship fast and communicate well. If there's a problem they will fix it.
Hope this helps someone out.
Be safe and Happy New Year!! Cheers !!!