From: nospam@needed.invalid   
      
   On Fri, 7/25/2025 7:55 AM, pinnerite wrote:   
   > On Fri, 25 Jul 2025 12:51:41 +0100   
   > pinnerite  wrote:   
   >   
   >> On Tue, 22 Jul 2025 11:36:46 -0700   
   >> Mike Easter  wrote:   
   >>   
   >>> pinnerite wrote:   
   >>>> A few weeks ago a young neighbour of mine asked i he could borrow a torx   
   sreedriver if I had one (some). At the time I had never heard of them.   
   >>>   
   >>> Your GMT tz looks like .eu or .en; but around here we have huge   
   >>> warehouse stores called Home Depot which has a wealth of so many things,   
   >>> incl tools.  The section which has screwdrivers and related tools is   
   >>> VERY extensive and a lot of fun to shop.  I was there not too long ago   
   >>> because I wanted to improve my collection of 'little bitty' screwdrivers   
   >>> between what I had for eyeglass repair and an ancient sewing machine   
   >>> screwdriver passed down from my mother.   
   >>>   
   >>> It is a lot of fun to shop in that section; I discover all kinds of   
   >>> things I never 'imagined'.   
   >>>   
   >>> --   
   >>> Mike Easter   
   >>   
   >> None of the stores within a five mile radius stock an "8".   
   >> One is coming from China, due 10 August!   
   >>   
   >> Meanwhile a replacement Corsair 850watt has been delivered and tested.   
   >>   
   >> On the assumption that the failures were due to short circuits, I   
   >> adhered fibre washers to a new Gigabyte B650 Aorus Elite AX motherboard   
   >> (where do they dream up these names), mounted it with one of the Ryzen   
   >> 7 CPUs installed and powered up.   
   >>   
   >> The fans started up but a warning LED (the CPU one) illuminated.   
   >> I tried a second Ryzen 7, same result.   
   >>   
   >> How can I find an engineer with the equipment to test both CPUs in NW   
   >> London, UK?   
   >>   
   > I forgot to add the DDR RAM was also installed.   
   >   
      
   Is the ATX12V power for the CPU plugged in ?   
      
   There can be two connectors, one is preferred.   
      
   The implementation of status indicators, uses the "dumbest method possible".   
      
   For example, imagine you put a flip-flop on the board, driven from   
   a GPIO, and a single particular CPU instruction clears the flop.   
   The flop can drive the CPU fail light. If the jump instruction   
   to the well-known location fails to execute (the CPU crashes on the   
   first instruction, an instruction that does not depend on the   
   presence of DRAM), then the flip-flop is not cleared and so the CPU   
   failure LED stays illuminated. This means, the CPU is not necessarily   
   "writing to the LED", it's a passive scheme where a failure to issue   
   a "clear" to the LED, leaves the CPU fail LED lit.   
      
   If the computer stays jammed in RESET, this causes the CPU fail to   
   come on, until you can get the thing out of RESET and the CPU is   
   sent off to the well-known location for its first instruction fetch.   
      
   The standoffs use a ground-ring, meaning they are intended to   
   touch the ground of the chassis-standoffs. There is usually a keep out   
   zone in the layout, around the standoff, such that moving the motherboard   
   off-center, does not crush any SMT R or C components.   
      
   On branded motherboards with "DO NOT POPULATE" standoff locations   
   on the bottom of the board, adhesive paper labels, arrow-shaped,   
   point at the standoff locations that "MUST NOT BE POPULATED". Always   
   visually examine the secondary side (bottom) of the motherboard, for   
   any labels of this type. This is not a normal practice, of booby-trapping   
   boards, but as a system builder, you are expected to be a Ninja and   
   familiar with all the tricks.   
      
      Paul   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)