Computer problems, to know!

Can not open the computer, open the power supply, green (power lights,) do not flash a red light does not shine no response! Display lights flickering, black screen, no self-test machine.Outlet replaced, re-plug the memory card, hard disk, optical area, is still the same!

re-system! There have been no noise ????? or no response to that???? Is a red light, and so it's hard not to light did not ah, no-power-on, take a look at the power box, plug another to see Hard not to?
Boot when the sound is what ah, ring on the normal life short, there is another voice that is different from the problems.CPU fan did not turn to? Like board or card problems.Very Obviously the processor or memory, can check the minimum system law