Mac Pro1.1 Flashing power light, red light flashes on ram

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Mac Pro1.1 Flashing power light, red light flashes on ram

Recently I had the issue with power light flashing and the red light on the ram board inside the Mac. I read that you should check for dust and move the ram modules to different slots. I did this and everything worked fine, this happened again and it all worked out.

But right now, I have the same issue, after testing different pairs together and changing the ram/8 modules around to different slots, nothing is working and the same problem persists.

When I start up, there is a one red flash from all the slots on the two ram boards.

Should I buy 2 ram modules to test it again? I can’t believe all the ram modules are dead? Or is it something more severe?

Posted on Feb 27, 2022 5:38 AM

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Answer 1

Feb 27, 2022 7:13 AM in response to ekaton

The power lights should be blinking a small number of times, then repeating. That number is an error code.

¿What number?

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Answer 2

ekaton Author

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Feb 27, 2022 5:48 AM in response to ekaton

To add - I’m currently using 32GB RAM. I tried the original 4 sticks 2x2GB which came with the Mac that I saved and the power light still flashes and the red ligjts appear

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Answer 3

Feb 28, 2022 8:58 AM in response to ekaton

The red lights on each RAM slot turn ON at Power-On, and are then turned OFF during the Power-On Self Test. If the test progresses and they are found to be GOOD, the lights are turned off. This can happen within a few seconds of power-On.

Lights that remain ON may indicate a module that did not pass the test.

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Answer 4

ekaton Author

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Mar 7, 2022 1:37 PM in response to Grant Bennet-Alder

Thanks for getting back. I see, I didn’t know that about the power light flashing and that it being an error code. From what I remember it was pretty regular. But at the moment I’ve got some ram inside the Mac and it’s working for now. When this happens again I’ll definitely take note of the light.

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Answer 5

ekaton Author

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Mar 7, 2022 1:49 PM in response to Grant Bennet-Alder

When all the ram modules where installed, the red lights turned on for about a second just after power on, and then turned off for all module slots. They didn’t remain on afterwards, I guess that this means the modules have passed the test and they are ok, could this be an issue if e.g. dust? But if they all passed how comes the power light still flashes?

As I mentioned above, it’s working ok now, what I’m going to do is either try and increase the ram inside as it’s quite low right now, or wait until this issue happens again.

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Mac Pro1.1 Flashing power light, red light flashes on ram

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