MP 6,1 Hardware Diagnosis - Kinda powers, never chimes or shows video.

[TrumanLA]

Trying to fix a Mac Pro (A1481) received in ‘non-operative’ condition:

• The input panel lights up when plugged in: [never shows video]
• The input panel lights up when Power pressed: [never shows video]
• Don't think the fan is spinning
• Unit shuts down after about 20 seconds
• Reset PRAM (no effect)
• Unit never chimes
• NO VIDEO after trying to get in to verbose Mode
• Replaced RAM (no change)
• Disassembled unit to inspect for issues (couldn't find any)

Haven't changed the CPU but have a CPU in stock to swap/test and it seems like a reasonable possibility...



PARTS I DON'T HAVE to TEST / REPLACE
(not in stock):
GPUs, CPU / RAM PCB, Power Supply


Ideas ...?

 

[vddobrev]

Start by resetting the real time clock - there is a little button under DIMMS 1 and 2, press the button for more than 1 second. Also replacing the battery may be needed.

 

[th0masp]

Depends on if there was an attempt to swap out the CPU, then a botched upgrade would be my top pick and might be an easy fix. Faulty GPU or faulty power supply would seem the most likely candidates in any other case.