On 05 Oct 2024 17:35:39 +0100 (BST)
Theo <[email protected]> wrote:

Davey <[email protected]d> wrote:

On Sat, 5 Oct 2024 11:46:02 +0100
Andy Burns <[email protected]> wrote:

Davey wrote:

when unpowered, it will not rotate, being presumably under the
total control of some stepper-type operator.

I've never encountered computer fans with stepper motors.

Hmmm. Puzzled, then. It makes a very slight chugging sound, similar
to, but not exactly like*, a bad bearing. It is almost inaudible
with the side installed on the PC, though.

I've never come across a PC fan that won't spin by hand when powered
off. It sounds like it's either powered but not enough to overcome
friction to start (eg low voltage or speed control set too low), or
bearings badly binding.

As you say it's not spinning when unpowered (ie PC turned off), that
rules out the first one. I'm thinking it would be worth changing the
fan.

It sounds like this is probably a red herring in relation to your
capture card issues.

Theo

There seems to be progress, if anybody is still interested in this
saga.
When I fired it up yesterday afternoon, it started up perfectly. A
noiseless fan, no warnings about Low Fan Speed or instructions to open
the BIOS, it just worked.
After I shut it down, I tried the fan, and it spun freely. I wonder if,
when I tried it before and it would not spin, did I have a hold of the
shroud around the impeller instead of the impeller itself? I will never
know. But it would explain the lack of movement.
I shut it down for the night, and again this morning, it started fine. I
opened the BIOS anyway, to check how I had left the fan speed control.
It is set at a manually set low speed of 30%, instead of the delivered
auto speed of 20%. Maybe I'll try 20% next time.

The new video card should arrive soon......

--
Davey.

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