Faulty Mac Pro "Red LED" on Processor Tray (not RAM LED)

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saleemmartin Author

Level 1

1 points

Faulty Mac Pro "Red LED" on Processor Tray (not RAM LED)

Hello.

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

Lawrence

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)

Posted on Aug 17, 2012 4:07 AM

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Answer 1

kaz-k

Level 8

49,038 points

Aug 17, 2012 7:13 AM in response to saleemmartin

Running Apple Hardware Test might be helpful, I think.

-- kaz-k

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Answer 2

saleemmartin Author

Level 1

1 points

Aug 17, 2012 7:37 AM in response to kaz-k

Hi Kaz-K,

Thanks for your advice. Unfortunately, as mentioned above, the Mac Pro does not startup and there is no signal from the monitor so I'm unable to run Apple Hardware test.

Lawrence

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Answer 3

The hatter

Level 9

60,980 points

Aug 17, 2012 7:54 AM in response to saleemmartin

Troubleshooting: My computer won't turn on

https://support.apple.com/kb/TS1367

Symptoms

If your Macintosh computer won't turn on, here's how to troubleshoot it. Please keep in mind that although your computer may display similar symptoms that prevent it from showing video, this article discusses what to do if the computer won't turn on, meaning that when you press the power button:

You don't hear a startup chime.
You don't hear any fan or drive noise.
The power button or power indicator doesn't light up at all.

If your computer doesn't display any video, it may display one or more of these similar symptoms when you press the power button:

You may hear a startup chime.
You may hear fan or drive noise.
You may see the power button or power indicator light up.

If any of these conditions occurs, see Troubleshooting: My computer has no video instead.

Resolution

If your computer won't turn on, try each of these steps:

Make sure that the power cord is plugged into a working wall outlet, and that it's properly connected to the power adapter. (To check if the wall socket is working, plug in a lamp or other electrical device.)
Make sure that the power adapter is properly connected to the power port on the side or back of the computer.
Disconnect all accessories that are plugged into the computer, such as a printer, hub, or other mobile device.
Reset the computer's PMU, SMC, or PRAM. Refer to the instructions for your model:
Mac Pro

reset SMC For "Mac wont' turn on or boot" and related

https://support.apple.com/kb/TS1367

Isolating Issues in Mac OS

http://support.apple.com/kb/TS1388

General purpose Mac troubleshooting guide: Isolating issues in Mac OS X

Creating a temporary user to isolate user-specific problems: Isolating an issue by using another user account

Identifying resource hogs and other tips: Using Activity Monitor to read System Memory and determine how much RAM is being used

Starting the computer in "safe mode": Mac OS X: What is Safe Boot, Safe Mode?

To identify potential hardware problems: Apple Hardware Test

General Mac maintenance: Tips to keep your Mac in top form

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Answer 4

saleemmartin Author

Level 1

1 points

Aug 17, 2012 8:21 AM in response to The hatter

Hi Hatter,

Thanks for the Apple Support snippet. I reset the SMC. No luck. It's also not possible to reset the PRAM as the bootup sequence doesn't reach far enough to perform that function.

I don't hear a startup chime, but the system fans are all running fine. The only fan running quickly is the Graphics card fan.

Regards

Lawrence

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Answer 5

kaz-k

Level 8

49,038 points

Aug 17, 2012 9:33 AM in response to saleemmartin

Following thread seems to me similar to your problem.

NO solution yet, though...

https://discussions.apple.com/thread/3505197?start=0&tstart=0

-- kaz-k

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Answer 6

Nov 3, 2012 8:10 AM in response to saleemmartin

Hi, did you found out what was the problem, because i'm having the same issue.

Thanks

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Answer 7

The hatter

Level 9

60,980 points

Nov 3, 2012 10:28 AM in response to saleemmartin

This is or should be archived and instead of trying to start on someone else thread... create a new one. 90 days idle threads are basically dead to all but OP.

PRAM reset is so early that it would take a dead component so that it can't do anything, there is nothing loaded or being loaded as it is "bong" and then 4-finger salute. It would have to not even be able to POST and generate the sound is that it?

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