Mac Pro 3.0 A1186 does not turn on, makes clicking sound, LED 5 & 6 flash

[Guest user1647]

Hi folks,

 

first post, hope you can help me.

 

Our Mac Pro 3.0 A1186 (early 2008, eight core) which was turned off for a while during Covid, now simply does not turn on anymore.

 

When pressing the power button, it makes a clicking sound, then 3-4 seconds later another one, and simply nothing happens. No fans spin up, no power light, nothing.

 

Diagnostic LEDs:

(A) both LED 5 & 6 flash once when the power cable is connected, no other LEDs light up

(B) when the DIAG_ LED button is pressed...

 

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Source: MacRumors