help start orange pi plus 看全部

hello I teho now orange pi plus.depois much tentafazer work could poem so works in hdmi and my development lab to lie screen DVI x HDMI. it happens that when I turn on this screen goes black nothing appears. how can I solve this? Orangi pi already have a system installed and the Chinese indioma and how can I change to Portuguese? also would like specific information how to install another system via cd card?