MP 1,1-5,1 Double Red diagnostic LEDs

[mhristau]

Likely power supply failing?
Machine boots up occasionally to desktop and sometimes not that far at all. Any opinions on this being bad power supply?

 

[KeesMacPro]

Likely power supply failing?
Machine boots up occasionally to desktop and sometimes not that far at all. Any opinions on this being bad power supply?

I'd start by replacing the RTC battery for a new one: BR 2032 (AFAIK Panasonic is the only manufacturer that still makes them).
For further troubleshooting you could download the Technician Guide (starts at pag.33).

https://tim.id.au/laptops/apple/macpro/macpro_mid2010.pdf

 

[mhristau]

I'd start by replacing the RTC battery for a new one: BR 2032 (AFAIK Panasonic is the only manufacturer that still makes them).
For further troubleshooting you could download the Technician Guide (starts at pag.33).

https://tim.id.au/laptops/apple/macpro/macpro_mid2010.pdf

Thanks for helpful link! Battery was still 3v after 10 years!?

 

[KeesMacPro]

Thanks for helpful link! Battery was still 3v after 10 years!?

Your welcome!

Well, after 10 years it's definitely time to replace it ; )
Although voltage may still seem 3.0 V , a battery voltage depends a lot on the load (=current draw).
In other words a new battery and an old one may both measure ~3.0 V with a multimeter.
The difference in voltage appears when there's a load: an old one will drop voltage a lot while a new one stays stable.

An old RTC battery can cause several funny issues , so that's why I'd start with the easiest/ most obvious culprit.
In case this doesnt solve the issue, I'd go through the troubleshooting procedure with a minimal setup.

 

[mhristau]

I will go ahead and replace the battery. (makes sense)
Did learn from the technician's guide that the double red LED flash when intermittently shutting down is normal and does not indicate a problem.

 

[mhristau]

Battery replaced with a CR 2032. Have ordered a BR2032.

Still shutting down unpredictably. Does remain up longer if it's sat powered down for a few hours?

 

[tsialex]

Still shutting down unpredictably. Does remain up longer if it's sat powered down for a few hours?

This the classic presentation of a defective PSU. Did you run AHT/ASD?

Btw, run AHT and ASD with the AppleOEM GPU.

For AHT, you need 022-4831-A.dmg:

GitHub - upekkha/AppleHardwareTest: Apple Hardware Test Download Links

Apple Hardware Test Download Links. Contribute to upekkha/AppleHardwareTest development by creating an account on GitHub.

github.com

For ASD, you need 3S149:

Information Architect Blog

As an information architect, these are a few tools, articles, and miscellanea that I find useful.

www.loremipsum.info