at电源故障~

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真的麻烦,接通220后风扇不转,电源不启动./关掉220后,电源内部发出"次"的一声响后电源扇转动一下.主板风扇仍不转,但是,要将这个电源放很长一段时间后.它仍可以工作,只是关掉,在短时间内再打开,就出现不启动现象~,
怎么回事?哪个件坏掉了?请各位达人帮帮我~~