fan in power supply

Hello, All! My subject on friction bearings failed. Well, I didn’t cover myself, but just began to groan suspiciously. If you knocked on the body, it could start roaring. He is old, he is already 4 years old. Replaced it with another one, on roller bearings. Flow the air from it is noticeably stronger, but it also makes a lot of noise. Through a closed door audible. The noise already gives me a headache... Who will advise what? I heard that there are silent fans. How is that? Principle what actions do they have? * Original written in ZXNET.PC *also sent to MAGGOTS.COLONY WBR, Jason. /*e-mail: jason2000(scary dog)yandex.ru ICQ: 62235830*/ /np:/ *silence*