Forcing hdmi output only

i have a zotac 9300 wifi itx board which has both hdmi and dvi connectors. however, the hdmi does not give out signal to my tv (i guess). only the dvi does. i also tried with a gt220 grahic card with the same result. i do not want to install windows and see if windows can output via hdmi. so the question is : can i force the hdmi as the only (or with dvi together) output by editting the xorg.conf file.

tried restarting the ipad ?
http://support.apple.com/kb/HT4057
it solves about 70% of all issues people in this forum have with pretty much all ios devices

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