why does my computer make so much noise. Its like there are bugs and crickets inside there. Its not the noise of the fan because I know the sound of that. Is it possibly because of the dust that is over the components. I haven't dusted since over 3 years.
I think you've answered your own question.
Additionally, there might be a stray wire or cable touching the fan blades. That can make some weird and obnoxious noises. Open it up and make sure things are arranged somewhat well.