Imac to Sharp aqeous

Ok first off yes i did check the forums and could find an accurate answer.
here is the issue:
Intel imac to sharp aqueous plasma( late 2007 early 2008 model)
from imac mini dvi to HDMI adapter then strait to HDMI input on tv.
we are trying to run front row as it is a simple interface, when selecting movie it loads but there is no video on tv and computer but there is audio, however when movie is opened in plain quicktime it plays fine on both tv and computer.
common things i have read are to turn off overscan and reset pram
what else am I missing any help would be great

One thing to note is that when you run Front Row, the movie plays on the screen that has the menu bar. So if your HDTV is the secondary screen and your iMac's screen is primary (it has the menu bar and dock), the movie will not play on your HDTV using Front Row.
On most video playback apps, you can pick the display to use for full screen by either setting it in preferences, or by simply putting the window with the video on that screen and giving the full-screen command. You can't do that with Front Row (at least as far as I know).
When you run Front Row, do you see the Front Row interface screen? If so, which display has that screen (before you start playing any movie).
Have you tried going to System Preferences Displays pane Arrangement tab and moving the menu bar from one display to the other? Try using Front Row. If that works as expected now, move the menu bar back (as before) and try using Front Row again.

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    There is a bit of detailed important information in the Apple link on how to upgrade the iMac RAM. There is a certain amount of RAM installed already and these chips would likely be removed if you get matching sets of new RAM to upgrade the capacity. And no matter what some say, there is a reason why they can be upgraded with more. Even with Mavericks OS X 10.9.x and its 'memory compression' etc, it would gladly accept all the RAM upgrade chips it could swallow. (Behind metal screen, mid-bottom iMac 27")
    You may need to consider questions about applications that use system resources separate from those about whatever issues your iMac seems to exhibit. There may be some other cause of the video and iMovie symptoms, but more RAM won't hurt given the beast you bought can use 32GB and it has 8.
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