uniracers wrote on 2025-01-26, 18:22:

@Nexxen Thank you for all of your help on this. Sorry, it's been a few days since I've been able to get back to this.

I measured the resistance across C73 and C74. I'm getting 10 ohms for C73 and 40 ohms for C74. Side question: I thought it wasn't possible/accurate to measure resistance when the components are in circuit?

Incidentally, I have another one of the same exact model board. I measured C73 and C74 on that board and was getting readings in the kiloohms. The issue with that board is that I get no video output (using the same video card, CPU, and RAM as the board with the keyboard issue), and there is no post beep. It does seem the board gets power because the CPU fan comes on. I thought I was closer to a fully working board with the one that has the keyboard issue.

It isn't a race, when you can do something you post something. 😀 I don't mind at all.

If you have a second board, exact same, you can try and switch components. It's also great to compare with a twin.

Yes, caps shouldn't be measured in circuit, but resistance tells us there's something pulling to ground somewhere. Not enough to cause a short, but enough to cause issues. A short wouldn't allow a power on.
It's just a matter of finding what it is. Well, I'd try replacing/switching c73/74 and RN50. But it could be something else. And as you are at it measure the ones from board #2 (I'd call them Bd1 and Bd2 for short)

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The 2nd board is a different thing, maybe open a new thread.
Could be a bad BIOS.

uniracers wrote on 2025-01-18, 20:11:

I have a Socket 7 build that I'm trying to get working, and I've run into a few issues. The motherboard is a QDI P5I430VX-250DM […]
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I have a Socket 7 build that I'm trying to get working, and I've run into a few issues. The motherboard is a QDI P5I430VX-250DM Explorer II w/SpeedEasy (https://theretroweb.com/motherboards/s/qdi-p5 … -explorer-ii-sp). When the computer boots, it goes through the memory test three times. Then I get a rapid, continuous beep that persists until I switch the power off. Also, keyboard input does not work, so I cannot access the BIOS. I'm using a PS/2 keyboard, and I've tried two different PS/2 to AT adapters. Not sure if the beeps are related to the keyboard issue.

Here is a video showing what happens:
https://www.youtube.com/watch?v=67z6nfOvMfk

If the memory tests pass, can I assume that the RAM is okay? Any suggestions on what to try?

News?