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Pavilion 790 power supply fan doesn't spin

Pavilion 790
Microsoft Windows 10 (64-bit)

I have a new Pavilion 790-0019 Desktop Gaming Computer. It seems to work fine, but I notice that the power supply fan does not spin, except for about 2 seconds at startup. Other than that, it never turns. I applied a heavy load to the machine (about 240 watts) for over 30 minutes, and still nothing. (Maxed out the CPU, GPU, and memory.) The top case fan operates normally.

 

It is a 400w PSU, HP part # 942332-001, model # 400W ENT18 EPA92, made by LITE-ON TECHNOLOGY model PA-3401-1. There is a small 7-pin connector from the PSU to the motherboard that appears to be secure.

 

Is this normal behavior? Even if it doesn't spin under low loads, I did expect that a high load would activate it. Since it spins briefly at startup, I presume the fan is operational.

 

Does anyone have a Pavilion 790 that can see if their PSU fan spins?

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Pavilion 790 power supply fan doesn't spin

I called HP support, and was given different phone numbers to call... 5 different times. Eventually, I was given the same number as an earlier call. Sigh...

They didn't know the answer. Closest they could answer was that it might just spin up when needed, but they had no idea under what conditions that might be.

I'm concerned that long-term use of the system with a non-functioning PSU fan might eventually cause it to die an early death. After some gaming, if I open up the case and feel the outside of the PSU, it feels fairly warm (about 45C). I imagine the inside components are getting much warmer than that.

If others with a similar system are seeing the same thing as me, then it's likely not a problem.

Anyone?

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