Upon pushing power button my mac pro sits in a holding status with the power light blinking continuously.  Fans kick on and it never goes to startup.  Trickle LED shows good as does the Power LED.  No RAM DIMMS are lit either.

Upon powering on my Mac, the power light begins to flash, the fans kick on and the it seems to lock up.  Screen does not come on.  I have confirmed it has Trickle and Power by checking the diagnostic LED's on the mother board.  No other LED's are lit.  None of the RAM LED's are lit either.  I removed the battery from the motherboard and waited ten minutes, then reinstalled it.  What could the issue be?
Mac Pro specs are:
OS X, Duel Processor, 2.6 GHz, Duel Core, Intel Xeon, 12GB DDR2 RAM

As a general rule, pairs in adjacent slots. Largest sizes on lowest-numbered slots on each riser in turn. It will in work most any order, then when you get close to a final arrangement there is a small .pdf manual available that shows "optimum" arrangement.
Mac Pro (original and 8-core) Memory Replacement Instructions

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