Subj : Re: Chirp Detector
To   : Barry Martin
From : Ky Moffet
Date : Sun Feb 20 2022 10:35:00

BARRY MARTIN wrote:
> HaHa! That sounds like something that happened here!  I could hear a low
> rumbling in the Living Room.  Computer in there is off; there is an audio
> amp with a fan but that's off (checked with my hand for a breeze).
> Heard the noise for several days -- same level: constant low-level
> rumble.
> 
> Finally had to go into the basement for something: ceiling fan had been
> left on in the room below the Living Room!  I was hearing the vibration!

Similar story... first summer here, why do I keep hearing a fan? After 
some stumbling around, located it... on the roof. Did not know this 
house had an attic exhaust fan that comes on automagically at some 
too-high-for-the-attic temperature. (Turns out it also has a manual ON 
switch.)

>   KM> Turned off CPU overheat alarm in BIOS. No more beeps!!
>   KM> Moonbase does not overheat, far from it. Dunno why the alarm
>   KM> setting was on. Probably hadn't looked in the BIOS in ten years,
>   KM> let alone fiddled with anything. Mind of its own? too many dead
>   KM> hellspawn gumming up its brain??
>   
> Maybe during a boot the CPU reached an abnormally-low heat setting,
> triggering the alarm.  I've notice this computer will heat up

I think more likely CMOS battery went dead (who knows when it was last 
changed, the board is now 19 years old) so it reverted to defaults. 
Since I have no reason to care about date on that box, and everything 
else is default, I wouldn't notice dead CMOS battery... for a 
looooooooooong time....

> immediately after a reboot and settle back to normal.  I'm thinking the

That's because right after bootup, it's BUSY. First loading the OS, then 
whatever other crap. Setting up the network connection is surprisingly 
CPU-intensive. If your UPS lets you monitor power output, you can see a 
big spike there as it goes through the boot process, then drop down to 
idle power draw.

> At least you noise was constant -- mine might not occur again for 20-30
> minutes!

Yours is more weird than mine. :D

Do you have a water softener? they do weird things at odd intervals.
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