I have Evo N800c laptop without sound. Device manager show everything as it should be. The speaker volume works on the screen up and down, but not sound coming out either from speakers or head set. Is there something I am missing like a cold solder or it is a faulty chip on the motherboard. I searched the web and there is nothing on this problem. There is a lot on the screen issues with this model, which is the cable, and I already replaced it. It has awesome graphics, but terrible ribbon cable desings. Thanks for any input on this matter.