I hadn't considered that the Power Supply might be the issue and looking at the pin out for ATX and the 20 pin connector from the PSU and I can clearly see that the -5v pin is unpopulated. Where those +4 volts are coming from is still a mystery but it seems reasonable to ignore it (and disable the …

Can I even ignore the fact that the multimeter is reporting +4v on the -5v rail?

I have an Asus P38-F motherboard that is reporting a voltage error in it's internal hardware monitor. It says the -5v rail is reporting -6v (the bios has the option to disable the HW monitor on a per rail basis so the error can be suppressed). What's even stranger is when I measured the -5v pin my …

Just got a replacement Motherboard (which also came with a CPU and RAM). The original CPU and RAM all work in this new board, so I guess this narrows it down to the motherboard. I may try and reflow the chipset chips to see if it helps but with a working system I will likely just put the board into …

I misread the POST codes they are EC and EB (not 3C and 3B), looking a the intel table of post codes only has a definition for EB ("Calling Legacy Option ROMs"). As for isolating the power supply as the culprit, I tried a different power supply from a known working system, same behavior, and the …

I found this page: https://www.intel.com/content/www/us/en/suppo … s-and-kits.html and it seems to suggest that meaning of the post codes are related to "recovery" though I can't find the exact codes of 3C and 3B the 30 to 3F range is dedicated to recovery messages

Ok I tried plugging back in the keyboard, video card and a stick of RAM and the error (and the code on the POST test card) persists (this is consistent with how I first noticed the problem, when the computer out of the blue started turning on whenever I flipped the switch to the power strip that it …

I tried pulling, cleaning, and reseating the CPU, and the RAM slots are empty, but I'll try anything more than once if there is a chance it can help. As for why I was thinking it was a short, the auto-starting of the power supply reminded me of something like this, https://www.instructables.com/How- …

Recently a computer that I build (which had worked flawlessly for a few years now) stopped making it through POST. I pulled out all of the boards (down to just the CPU), and the behaviors are the same. When I plug it in it imminently powers up (why I think it's short) and never beeps. I tried a …

This is where I have been spending most of my time for the last couple weeks. I've recently started rebuilding a 386 DX33 that had belonged to my mother. It was the computer I first learned to program on. You can see it on the right (it's the bottom desktop), and it's running DOS 5 with Windows 3.0 …

I have an AWE32 PnP ( http://www.vogonswiki.com/index.php/Creative_Sound_Blaster_AWE32_PnP_(IDE) ) which is throwing errors. The card appears as a Plugin Play card in the BIOS POST, and I can hear voices in King's Quest 6 CD, but no music. In AUTOEXEC.BAT I have this line: C:\SB16\AWEUTIL /S Which …