Make my PC QUIETER!

Any suggestions on how to make a desktop pc quieter? The noise really annoys me :a:
It’s got fans:

  1. On the CPU
  2. Power Supply
  3. Video Card
    It’s got one on the case, but I unplugged that one. I even put the thing underneath my desk, plus I’ve cleaning the fans, vacuumed inside (for dust), but it still sounds like a BMW idling at 3000rpm:sure: - which can get really annoying when it’s left on at night.

Are there any sure-fire no-doubt works-every-time solutions to this? is there a special thing (I dunno) that I can buy? Perhaps a special case? New fans?

I mean, my laptop doesn’t need to make so much noise… neither do Macs. I WANT A QUIETER PC!!! :run: