Hi all. I just recently purchased a pair of yamaha hs50m's which I'm using in conjunction with my focusrite saffire firewire audio interface. To make a long story short I was getting some dreadful noise through the monitors. When I unplug the power supply from my laptop and run from battery power, the noise dissapears completely and my entire system is functional. I don't want to run off battery power when working on projects.. I tried to run my laptop cord out to another room to another power source and what do you know.. no noise. Tried another room's outlet.. no noise. back to any of the outlets in my room, and there's enough noise to make your ears cringe. I've tried distancing certain items in my chain.. laptop, sound card etc from my monitors which has no effect on the noise. It dissapears when I plug into another room's outlet. I don't have a HUGE problem running an extension cord for my laptop's power.. but that would be a less elegant and more temporary solution than I would like. Does anyone know enough about electrical setups to give me some options? I'm at a loss and ideally I'd like to keep my studio self contained within the room. Can i affect the power in some way before it gets to the room? Can I purchase some kind of power conditioner, would that apply in this situation? Can I have somebody look at what may be a poor electrical job and do some rewiring? Anything you folks could throw at me to consider would be a breath of fresh air. Cheers!