Trying moving the guitar around and sit in different spots in the room. You'll notice noise if you face the pickups towards your pc monitor, lights and or other major electric outputs. Happens with all electrics, you just have to find a quiet spot and try turning the gain down a little (some houses have a lot more electrical interference than others). The alternative (necessary for a big rig) is investing in a noise reducer like a Rocktron Super Hush or an ISP Decimator.