From: jj4public@outlook.com   
      
   On Sat, 10 Sep 2022 13:00:56 +0100, Terry Pinnell wrote:   
   >   
   > The above was mostly outside my technical grasp, sorry. But can you   
   > answer a basic question please. In the unhappy event that my desktop   
   > PC fails to boot, my first step would be to ensure my speakers are   
   > powered on. Can I then rely on getting all the POST messages that I   
   > would have heard on much older PCs?   
      
   PC motherboards should still either have a connector to a PC speaker, or   
   have a buzzer attached on the motherboards themselves. For those without a   
   buzzer on the motherboard (i.e. with a PC speaker connector), it would   
   depend on whether the PC case includes a PC speaker or not. Some PC cases   
   nowadays no longer include a PC speaker, so the PC speaker connector on the   
   motherboard is not connected to anything, or can't be connected to anything   
   unless we manually add a PC speaker ourselves. Thus, without a PC speaker,   
   no beep sounds will be heard, even though the BIOS/firmware POST do generate   
   the beep signal.   
      
   > Did those (which usually relied on a tiny piezo transducer to deliver   
   > the beeps) include any concerning the power supply? Presumably not,   
   > unless they were dependent on the battery?   
      
   Motherboard buzzer or PC speaker do not take power from the motherboard   
   battery. They take power from the power supply which is fed to the   
   motherboard. The motherboard battery is exclusively for keeping the   
   motherboard clock and BIOS/firmware CMOS NVRAM chips powered on, so that the   
   clock is still running and the clock/date part of the CMOS NVRAM can be   
   updated.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)