Hi.. I have had a Dvd burner in my pc for a while now with a normal cd rom in the other slot and all works fine..Yesterday my friend gave me his HP dvd840 lightscribe dvd burner and when i put in in with my other burner it wont work right? When i put it in by itself it works fine and even with the normal cd rom. As soon as i put the 2 dvd burners in at the same time though they wont work? I can open both drives up so i know its getting power. If anyone could tell me what could be the problem it would sure be helpfull.. If theres any more info i can give let me know thanx.