Its unusual because the identical HTPC running at my friends place is able to output to 3 displays. The only difference is the computer monitor is rather old and its running VGA to a DVI adapater.
In this post the user changed to a different CPU and it worked. While another user has the same issue as me.
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GA-F2A88XN-WIFI (rev. 3.0) tripple display
If I can't really run 3 displays , is there an adapter to duplicate two displays and one display?