I get a static sounding noise(not real static) from the speakers whenever I use the scroll bar in Ubuntu. Should I be looking at the operating system, the motherboard or the PSU? Any help would be appreciated as this seems like a weird problem.
This may be caused by electrical noise coupling from one cable to another. I would try a quick test. Adjust your speaker cables, video cable, and mouse cable so that they aren't routed next to each other. If they have to cross, do it at a right angle. If they need to travel together (e.g. though a hole), spread them out both before and after they come together.
If this helps, then you can minimize the problem by creative cable routing, or by installing clip-on ferrite beads at each end of each cable...
Is this a laptop or desktop? If laptop, are you using external mouse/speakers/monitor?
If desktop, I expect your monitor is generating the noise and it's being picked up by the speakers in the input line wires, before it gets amplified (which is why you can hear this tiny amount of static). You can try using headphones to make sure that's the issue, or try moving the speakers and their input cable away from the monitor and its signal cable. If it is the issue, you may be able to filter the noise with a ferrite toroid.