Won't Boot -- Blinking PowerLED of Death

Hi,
So I was upgrading the RAM on my Mac Pro and now the computer won't boot. It turns on and all I get is the blinking power LED. It's blinking once per second. I know that typically this means that the RAM isn't seated correctly. So I have reseated the RAM at least 10 times now. I have also tried taking out the new ram, and using the standard RAM that came with the computer, still not booting. I've tried swapping the riser cards. I've tried booting with just one riser card and alternating the slots and which card; still no boot. I have checked the seating on the harddrives, and the video card and anything else I can see. Still not booting. I've tried booting with a single ram stick in every slot, and even tried the same thing with all four sticks of ram; still nothing. I have also tried pressing the SMC RST button, no help.
*NOTE 1: When I turn on the computer, all four red LEDs on the riser card(s) light up for a second and then turn off.
*NOTE 2: When the power is on and I press the DIAG LED button, I get this only: TRICKLE - Orange, PWR ON- Green.
I guess my question is: where's the problem? Is there any way I can definitively tell if it's the riser card(s)? Is there a way I can just check the ram itself? How can I check to make sure it's not the logic board? Any help in what I should check would be greatly appreciated.

This problem also happened to me. Last week, I awoke to the blinking power light... Tried rebooting and no luck. Several times.
I read this thread and thought I would try swapping the memory around.
It worked! My MacPro is back to life - I was upset because it meant a trip to the Apple support center... Even though I live in Mexico City and there are the Authorized Apple Service Centers I'm glad I tried this before packing it up for observation. I can only conclude that this may happen again so for now let's hope all is well... and at best a temporary glitch. The odd part is that this happened two days after I moved my hardware to another location. I though perhaps a power surge occurred and tweaked the hardware.

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