7 Replies Latest reply: Nov 3, 2012 10:28 AM by The hatter
saleemmartin Level 1 Level 1



I have a faulty Mac Po and wondering if someone can advise.


There's a red LED constantly switched on on the processor tray (see photos). It is not one of the RAM diagnostic LEDS.


The Mac Pro does not load up. It does initialise the RAM and boot up the Hard Disks.


At the same time the Graphics card fan spins very fast, and no input is detected on the display. I have removed it (in the photos) just in case it overheats.


I have plugged in the graphics card and processor tray on an identical Mac Pro and they both work fine. I have also swapped out the small button-battery fo a new one.


I have also unplugged all cables, reseated the RAM and removed any non-Apple RAM, leaving the shipped RAM in place.


If anyone has any ideas what this might be I'd be grateful for a response.


With thanks in advance




Info & Images below:



Model Name:Mac Pro
  Model Identifier:MacPro4,1
  Processor Name:Quad-Core Intel Xeon
  Processor Speed:2.66 GHz
  Number of Processors:1
  Total Number of Cores:4
  L2 Cache (per Core):256 KB
  L3 Cache:8 MB
  Memory:6 GB
  Processor Interconnect Speed:4.8 GT/s
  Boot ROM Version:MP41.0081.B07
  SMC Version (system):1.39f5
  SMC Version (processor tray):1.39f5




Mac Pro, Mac OS X (10.7.4)