Mac Pro PSU fan not spinning...

System: Mac Pro (early 2009)
After a while the system shuts itself down, and then repeatedly does so while trying to boot back up. After letting it sit a couple of hours, it boots back up, but again starts shutting itself down.
I opened it up and noticed the PSU fan was not spinning - which eventually caused the PSU to overheat and power off.
I ran a hardware test, and got the following error...
4MOT/1/40000002: PS-0
I searched on the Internet for this error, and it seems (I assume) that this error means the PSU fan is bad, but I plugged it into another fan port on the motherboard and it worked fine. I then, plugged one of the other fans into the PSU Fan port and it did not work.
I reset the SMC.
I reinstalled the OS (Snow Leopard)
I loaded "Fan Control" software (PSU Fan stays at 0 RPM and cannot be manually adjusted.)
At this point I'm guessing it's either the power supply itself (which I find hard to believe), or the PWM controller for the PSU Fan is not working. To get around the issue, I'm ordering a "simple" (2 wire for power only) fan to replace the built-in fan and a manual (knob) speed controller. (Total of $10, until the real issue can be determined.)
If anyone could help any further, I'd appreciate it.
===========
Wanted to add reason I didn't think it is the PSU...
Red LED flashes when power cord is plugged in and again when it's unplugged.
PSU PWROK LED is green
5V STBY LED is amber
Tags: Mac Pro, 2009, PSU, power supply, fan, PWM

Most of the fans in the cabinet are under control of the SMC software. They do indeed run full speed with no software intervention, as a fail-safe mechanism. (Software crashes, fans roar at top speed.)
A program like "SMC fan control" can provide visibility to the temperatures, and SOME control of the base fan speeds. My recollection is that the PSU fans 'do their own thing' (unlike the main cabinet fans) and are not software controllable. Components inside the power supply determine the temperatures and adjust its own fan speeds.
If that is the case, when used in combination with your analysis above, you should be able to trace back to an output amplifier (intended to modulate fan speed) that is DEAD and stuck at an output that is telling the fan not to spin. I would hope a 29 cent component was responsible.
A short in the backplane seems exceedingly unlikely. Most of what the power supply does is directly onto its discrete wiring harness. The main DC harness to the motherboard uses high-current connectors. Using more than one of those for signaling or fan speed seems more wasteful than power supply designers could tolerate.

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