接上power cord 后, 电源的box灯就亮了,然后按Power On按钮, 电源风扇, case风扇和 CPU 风扇都转了, 然后 CD-ROM unit power 灯亮了一下。 Then nothing happend any more.
最后, 一定要按Power On按钮for a few seconds, then system will shut off.
It is HP a6600 machine.