IMac 24" (early 2009) Mini Display to HDMI possible?

As there is no Mini Display to HDMI adapter available as of yet I tried to connect a new 24" iMac (early 2009) to a Sharp LCD TV via: Mini Display --> DVI --> HDMI.
Although the iMac recognizes the Sharp and switches resolution automatically (I also tried every other available resolution) the TV screen stays black (HDMI is EXT 5, but I also tried the other EXTs).
I googled and it seems to me that our setup works for some people with some LCD TVs (Sharp too).
Any thoughts where the problem here could be?

Open System Preferences Displays pane Display tab. If there are two displays being recognized, there should also be an Arrangement tab, but stay on the Display tab.
Click the button that says +Gather Windows+. Although you cannot see the image on the TV (since you say it is black), you should now get the control window for that TV display on your iMac's display.
Try making adjustments to the resolution and refresh rate to see if you can get a response on the TV's screen.

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