I have an EVGA 750i SLI FTW motherboard and recently (after moving the motherboard to a different case) there is no sound coming from the rear ports. When I connect headphones to the front, the sound works. Is it a sound card problem (I'm using the integrated card)? It's not a big deal, I can just pick up one for 20-30 bucks but I just want to know the problem beforehand. Thanks in advance.