MP 1,1-5,1 continues red light on processor tray

avatar1349

macrumors member
Original poster
Feb 25, 2009
59
13
Netherlands
I got a continues red light on the processor tray. Power works, fans turn slowly. This morning (like 20 min ago) changed the processor for the same one (X5670 - 2.93 Ghz - 6 core) but the light still stays on. I'm not that hardware savvy to possibly find out what the problem could be. Read the repair manual (page 30 -40) and the only thing I can find is that the processor isn't there (but it is) or in overtemp state (PROCHOT). Got no video output (which is (I guess), logical. Should I still be able to reset my PRAM with a usb-connected keyboard? I'm sort of lost now, so any suggestion or direction would be very much appriciated
 

bsbeamer

macrumors 68040
Sep 19, 2012
3,654
1,930
Have you checked the RAM in system report?
Are you positive all modules are working and reporting correctly?
 

avatar1349

macrumors member
Original poster
Feb 25, 2009
59
13
Netherlands
Yes, all the modules worked correctly before this problem. Got a bootable backup on a NVMe in a OWC portable case (checked that on my Macbook Air - early 2015) and that works. I don't hear a chime, so resetting the PRAM is a bit difficult. Bootrom, by the way , is already 144.0.0.0.
 

Macschrauber

macrumors 6502a
Dec 27, 2015
819
315
Germany
Make a smc reset (Pull power cable for a while)
Pull all Memory but one.
Pull everything out the mac what is not needed to get at least the mac to post (chime).
 
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avatar1349

macrumors member
Original poster
Feb 25, 2009
59
13
Netherlands
Make a smc reset (Pull power cable for a while)
Pull all Memory but one.
Pull everything out the mac what is not needed to get at least the mac to post (chime).
Did that; no succes As soon as I switch power on light comes on; fans slowly turning
zie screenshot
processor-tray.jpg
it really is doing me in; could be the backplane? (or whatever you call it) or logic board?
 

Macschrauber

macrumors 6502a
Dec 27, 2015
819
315
Germany
Try to lend another cpu board for test sake. Even a 4.1 cpu board is good for test run, it sets the fans to full speed but its just for identifying the culprit.
 

avatar1349

macrumors member
Original poster
Feb 25, 2009
59
13
Netherlands
Try to lend another cpu board for test sake. Even a 4.1 cpu board is good for test run, it sets the fans to full speed but its just for identifying the culprit.
I considered that; but its almost impossible here in the Netherlands to find someone in my neighbourhood who has a MacPro .... lol Thanks I still got my Macbook Air ... lol
- - Post merged: - -

I considered that; but its almost impossible here in the Netherlands to find someone in my neighbourhood who has a MacPro .... lol Thanks I still got my Macbook Air ... lol
Screen Shot 2020-02-12 at 16.48.35.png Screen Shot 2020-02-12 at 16.49.20.png
 

Snow Tiger

macrumors 6502a
Dec 18, 2019
854
567
I just received a DP Mac Pro 4,1 > 5,1 in my shop that had this issue . It was not a failed memory module . It was a little piece of metal in the DIMM slot of the CPU Tray . When I cleaned and let dry the Tray , the light went off .

Clean your CPU Tray with compressed air 60 PSI at 6 inches ( 150 mm ) . Blast everything , including underneath the PCB of the Tray and the fins of both heatsinks . A lot of dust will fly out , so don't be alarmed . It's a ten year old computer . Let dry thoroughly for 12 to 24 hours before installing in the Mac .
 

avatar1349

macrumors member
Original poster
Feb 25, 2009
59
13
Netherlands
I just received a DP Mac Pro 4,1 > 5,1 in my shop that had this issue . It was not a failed memory module . It was a little piece of metal in the DIMM slot of the CPU Tray . When I cleaned and let dry the Tray , the light went off .

Clean your CPU Tray with compressed air 60 PSI at 6 inches ( 150 mm ) . Blast everything , including underneath the PCB of the Tray and the fins of both heatsinks . A lot of dust will fly out , so don't be alarmed . It's a ten year old computer . Let dry thoroughly for 12 to 24 hours before installing in the Mac .
Wow, thank you sooo much; that'll gives me hope again. I''l get a can of compressed air tomorrow morning and start checking and go about as you descibed it. Or is it better to use some more powerful air blast? Got a friend,who has a computer shop and has an air blaster (as I would call it) that is more powerful than a can of compressed air. Thanks again for the tip!!! (btw, got just 1 cpu in the Mac - 1x X5670, 48 GB RAM)
 

Snow Tiger

macrumors 6502a
Dec 18, 2019
854
567
Wow, thank you sooo much; that'll gives me hope again. I''l get a can of compressed air tomorrow morning and start checking and go about as you descibed it. Or is it better to use some more powerful air blast? Got a friend,who has a computer shop and has an air blaster (as I would call it) that is more powerful than a can of compressed air. Thanks again for the tip!!! (btw, got just 1 cpu in the Mac - 1x X5670, 48 GB RAM)
No , don't use canned air . There are chemicals inside the can and it's not as green . Please obtain access to a real compressor .

Also , remove the memory modules from the Tray first so you have access to the DIMM slot interfaces !

Once your cleaned Mac is up and running again , and hopefully that red LED disappears , run Memtest on your memory configuration . Make a bootable USB thumb drive with Memtest86 as you will be able to test all the memory except 200 MB or so the program requires .


If you want to run this test in a macOS session , you won't be able to test as much memory . However , you will be able to test for ECC errors in real time . Just close and reopen System Report every time you do . And then hit the memory selection to get that window open . It requires a refresh to update ECC test results .
 

flaubert

macrumors 6502
Jun 16, 2015
304
63
Portland, Oregon
One caveat about a "real compressor:" sometimes tiny droplets of lubricating oil are in the air stream. To test for this, first spray the compressed air against a white sheet of blank paper. If there is oil in the air stream you'll see it as tiny specks on the paper.
 

Snow Tiger

macrumors 6502a
Dec 18, 2019
854
567
One caveat about a "real compressor:" sometimes tiny droplets of lubricating oil are in the air stream. To test for this, first spray the compressed air against a white sheet of blank paper. If there is oil in the air stream you'll see it as tiny specks on the paper.
Yes , and never point a nozzle at a living creature . Anything solid accidentally in the line could shoot out and hurt someone . People in the industrial sector are warned about these safety concerns . But it's pretty rare . I have used compressors for the last 40 years and I don't recall anything solid shooting out of the hoses I have used .
 

Macschrauber

macrumors 6502a
Dec 27, 2015
819
315
Germany
I am used to shoot a few seconds on the floor to avoid water and oil in the hoses when using a compressor. Also it is good to have an oil free compressor or a filter like painters use.
 
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