I have a early 2009 Mac Pro here with the 8 core option. It has been running on a properly maintained battery backup since it was installed as a server. It no longer will post with startup chime and shows little signs of life. I can't seem to find a service guide that says what the CPUA /CPUB Overtemp lights mean when they're solid.
Learning More, Service, and Support If your Mac Pro needs service, take it to an Apple Authorized Service Provider or contact Apple for service. You can find more information about your Mac Pro through online resources, onscreen help, System Profiler, or Apple Hardware Test.
Apple Service part replacement for Mac Pro (A1289) We carry parts and tools for all Apple and Amazon Kindle models.

'Apple Mac Pro Early 2009 Service Manual Repair Guide' manual can be saved to any computer hard drive, flash storage, burned to a CD or DVD ROM or any other digital media. Once manual is downloaded any number of pages could be printed or it could be printed in whole. Hello, I have a Mac Pro (Easrly 2009) - A1289 - MB871LL/A - MacPro 4,1 with a no power problem. First thing that I did is remove all components and peripherals including the optical and hard drives, memory, CPU, all fans, graphics card, and therefore ended up with just the logic, processor and power switch boards.

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Mac Pro 'Quad Core' 2.66 (2009/Nehalem)

2.66 GHz Q. Core Xeon W3520

Intro.	March 3, 2009	Disc.	July 27, 2010*
Order	MB871LL/A	Model	A1289 (EMC 2314)
Family	Early 2009	ID	MacPro4,1
RAM	3 GB	VRAM	512 MB
Storage	640 GB HDD	Optical	18X DL 'SuperDrive'
Complete Mac Pro 'Quad Core' 2.66 (2009/Nehalem) Specs

Mac Pro 'Quad Core' 2.93 (2009/Nehalem)

2.93 GHz Q. Core Xeon W3540

Intro.	March 3, 2009	Disc.	July 27, 2010*
Order	BTO/CTO	Model	A1289 (EMC 2314)
Family	Early 2009	ID	MacPro4,1
RAM	3 GB	VRAM	512 MB
Storage	640 GB HDD	Optical	18X DL 'SuperDrive'
Complete Mac Pro 'Quad Core' 2.93 (2009/Nehalem) Specs

Mac Pro 'Quad Core' 3.33 (2009/Nehalem)

3.33 GHz Q. Core Xeon W3580

Intro.	December 4, 2009*	Disc.	July 27, 2010*
Order	BTO/CTO	Model	A1289 (EMC 2314)
Family	Early 2009	ID	MacPro4,1
RAM	3 GB	VRAM	512 MB
Storage	640 GB HDD	Optical	18X DL 'SuperDrive'
Complete Mac Pro 'Quad Core' 3.33 (2009/Nehalem) Specs

Mac Pro 'Eight Core' 2.26 (2009/Nehalem)

2.26 GHz Q. Core Xeon E5520 x2

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Mac Pro A1289 Service Manual