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no post, no lights, just buzz from case speaker - dc7900 SFF

dc7900 SFF

I am refurbishing some dc7900 SFFs for student use.  I don't know their histories, only that they were used in some county offices. 

 

One of these emits a buzzing sound from the case speaker al soon as the power cord is plugged it.  It doesn't post.  No respose to the power switch.  No lights anywhere, on the motherboard, front panel, rear panel or keyboard.  Nothing on the display. The buzz persists 8-9 seconds after the power cord is unplugged. 

 

What does this indicate?  

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