My Yamaha hs50 monitors are producing a fuzz noise when my computer is on. The speakers are fine cuz they work when connected to my laptop through a pci express card. They are connected to a Focusrite saffire pro 24. The noise gets louder when i scroll up and down web pages. I have everything plugged into a conditioner. Its not the interface cuz i replaced it with a new one out of the box to check and also switched the cable. I use both the firewire 400 port on the case and a pci card with 3 ports and changed the port to legacy and everything. I did just about everything possible but this fuzz is not going away. There is also a really high pitched ring thats annoying. These are the specs of the computer:

-intel i5 2005k 3.3GHz
-1.5 T HDD (7200rpm)
-750 Watt Power supply
-Asus P8Z68 motherboard
-8 GB RAM

please help. This is a major issue.