hi everyone.....recently i bought denon 1611 + polk audio rm6750. i connect my dell laptop to the receiver via hdmi out from ATI radeon 4750 graphics card. . i tried various combinations to get the 5.1 effect but i am not able to do....its showing that the audio input form is 2ch. what is the solution for this? how can i get 5.1 ch output from laptop and how should i connect to the receiver.....does the receiver can convert the signal from 2ch to 5ch? i think i should..plz help me out..