How can I get my 2010 mac book pro to send signal out through the mini display port? end signal out through the end video signal out through the

How can I get my 2010 macbook pro to send signal out through the mini display port?

First, what you said is contradictory. You say "can't get a video signal", then say"the Mac wallpaper is broadcast, the mouse pointer is visible". "No video signal" means an absolutely black,blank screen. It sounds like you have plenty of signal.
I am supposing what you are seeing is actually a blank desktop, which is to be expected if your settings are such that you are extending the desktop, instead of mirroring it.
Within the preference panes is a setting that allows you to change this. Open System Preferences, click Displays, and then click Arrangement. You will see that you are extending the desktop. Change that setting.

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Since you have not identified exactly what MBP you have, but mention DVI, I suspect a cable such as this is what you will need.
http://www.ebay.com/itm/like/380694416929?lpid=82
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Message was edited by: marioart

In any case, this system does not support two 30".
I honestly don't think the 4870 with that adapter can support two 30". Just using the adapter itself would not give me the normal resolutions on my 30, where as the DVI port did. Luckily for me the adapter worked fine on my 20".
Truly I don't know why Apple would sell a card and not say just what displays it can power.
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How can I get my 2010 mac book pro to send signal out through the mini display port? end signal out through the end video signal out through the

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