I've just cleaned the inside of my PC so its dustless. But my power supply is making some very loud buzzing noises (sounds a bit like a lawnmower) It made buzzing noises before i cleaned it but not as bad. Now its constant. I've taken the power supply out of the computer and noticed some liquid coating on the back of it. Is this normal? Please help me fix the buzzing noise. Its only got worse after i cleaned it.