Tektronix 7844 problem

Hello !

I have a tektronix 7844 mainframe, and when I power it up, I have no
display, and the fan is not runing at all...
I only hear a "clack" aproximatively 2 times per seconds coming from
the psu

Is anyone have any idea of the source of the problem ? Is anyone have
already saw such a problem on a tektronix 7xxx series mainframe ?

Thank you for your answer

Have a nice day

Antoine

.

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