High-pitch noises coming from computer when different USB peripherals are plugged in
This is a long shot, but I thought I'd ask anyway. I built my machine to be quiet and I used to be able to barely hear it except for a light humming sound. However, recently, I've been hearing short high-pitched "blip" sounds coming from the motherboard area of my case (i.e. its not interference with my sound card being heard through my speakers).
I've found out that unplugging USB peripherals stops the noise and that different peripherals cause different patterns of blips. For instance, my USB tv stick makes about 4 blips a second when plugged in and my ipod makes 1 blip every 2 seconds. Suffice to say, it's really really annoying.
Has anyone any idea of what I can try except replacing my motherboard? It's driving me mad!