Mac Pro (2006) will not power on

We've got a 2006 Mac Pro in our lab that had been running perfectly well until this week.  We shut down all of the lab computers on Fridays and restart them when we come in on Monday.  When I pressed the power button to start the Mac Pro two days ago, nothing happened, no fans, no click, and no chime.
Mac Pro w/dual-core Intel Xeon, 2.66 GHz, OS X 10.7.5
What I've looked at so far:
Unplugged everything from the Mac except the monitor, keyboard and mouse
Checked that the power cord was properly inserted into the Mac and the wall outlet
Checked that the outlet was getting power by plugging another device into it
Checked for a flashing power button light - not flashing or lit
Reseated all RAM modules
Checked diagnostic LED lights - none of the lights were illuminated and none illuminated while pressing the DIAG_LED button
Verified that we haven't installed/reconfigured any new hardware or software - we have not, since early 2014
I'm thinking that it must be the power supply but wanted to see if there were any other ideas.
Thanks

The solution for debugging from "dead" is to remove absolutely everything: all drives, all PCIe cards, all RAM, all peripherals. The thought is that something may be dragging down the power.
A thorough SMC reset can be performed on all MacPro models by removing the AC power cord, pressing the power-on button for a quarter minute to completely discharge the power capacitors, re-installing the AC power cord, waiting a quarter minute, then pressing the power-on button. [It resets automatically after the DC power has gone completely to Zero, then returned to normal levels.]
With NO RAM DIMMs installed, the computer should power up the fans and blink the Power-on light under Processor control. If it does, the Processor and ROM and Busses are working, and adding back RAM should produce a Chime.
One other item that sometimes precludes booting is a dead PRAM Backup battery (coin cell). It sits in a delicate holder behind the graphics card slot. A new battery measure a bit over 3 Volts, measured in hand or in-circuit with the AC power cord removed. If you measure in-circuit with the AC power cord connected, you are measuring the "always-on" backup power supply, not the battery itself.

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