Is there a setting in the bios for enabling 5.1 as opposed to 2.1 Mustapha ?
You say that the rear channels are into LINE IN,that doesnt sound right
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Can you tell us which mobo you are using so that we can see the connections available or put a link or a pic of the mobo on here to save us searching

Incidentally my speakers threw me when I got some new ones,only 2.1 for me but with a subwoofer,they were colour coded for the connections using the speakers and subwoofer itself as junction boxes but I hadnt noticed that at first
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