Mac Pro won't power up. Power indicator light blinks rapidly

2008 Mac pro, Mountain Lion

Blame it on FBDIMMs that are dual channel DDR2.
Adjacent slots make a pair, not one from Riser A and one from Riser B.
There are the Apple tech notes, they use to publish and allow access to the Mac Pro Developer Note but those got taken down which were better and technical - can't have users actually knowing those things! :-)
2008 - best memory performance with all 8 DIMM slots populated.
How To Install and Remove Memory Mac Pro
https://support.apple.com/kb/HT4433
2008 Mac Pro Memory Arrangement
http://eshop.macsales.com/Customized_Pages/Framework.cfm?page=install_videos/mac pro/macpro_quicksheet.html
Ideal RAM config is 8 DIMMs - offers 17% improvement memory bandwidth  performance
667MHz FBDIMMs are cheap, excellent and 4% 'hit' you would never know about.
http://www.barefeats.com/harper5.html
For best performance on Mac Pro, install memory in risers symmetrically
The Mac Pro comes with two memory riser cards, each with four DIMM slots. With a total of eight slots, you can add up to 16 GB of memory.
Note: DIMMs must be installed in pairs of equal size from the same vendor. For instance, you must not have one or three DIMMs on either riser at any time. Additionally, two DIMMs from different vendors should not be combined and used as a pair.
Other configurations of DIMM pairs are still compatible with Final Cut Studio, but may not achieve the same performance levels as when DIMM pairs are installed on both risers evenly.
Riser A contains:
Riser B contains:
2 x 512MB
2 x 512MB
2 x 1GB
2 x 1GB
2 x 2GB
2 x 2GB
4 x 512MB
4 x 512MB
4 x 1GB
4 x 1GB
4 x 2GB
4 x 2GB
https://support.apple.com/kb/TS1957

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