Despite Tyan generally having a reputation for rock-solid stability, this board in particular was a really fickle beast. I had one a year or two ago - I liked the idea of slot+socket with universal AGP and ISA in a test system. It was hell. Eventually I found a DFI board (TA64-B) with exactly the same feature set. I sold the Trinity 400 (despite explicitly mentioning it was a tricky board, the Tyan name helped shift it fast) and didn't look back.

The problems I had were almost all BIOS related. In particular, any hardware configuration change (such as inserting or removing a PnP PCI or ISA card) tended to trigger a CMOS checksum error, requiring a CMOS clear to get it back working again. But there were also resource conflicts (again PnP playing up, and sign of sloppy BIOS code) and detection issues.

But...

Despite my dim opinion of this board, it doesn't correspond to your experiences, so let's start with the basics. Get one known-good drive, jumper it for master and hook it up on the primary interface with no other drives. See what happens. Then try it on secondary. Then put it back on primary and add a (correctly jumpered) slave. Note that some (WD...) drives have separate settings for "single drive" and "master with slave" and will only work if exactly correctly set.
You also have a floppy drive error. What's going on there? If FDD and HDD are failing, it sounds like your modular PSU isn't delivering power correctly to the molex. Check the voltages coming out of the molex connectors.

Seems to be a board from an old MicronPC system - if you can, maybe try the latest Tyan bios (v1.07)

dionb wrote on 2020-09-24, 07:45:

Despite Tyan generally having a reputation for rock-solid stability, this board in particular was a really fickle beast. I had one a year or two ago - I liked the idea of slot+socket with universal AGP and ISA in a test system. It was hell. Eventually I found a DFI board (TA64-B) with exactly the same feature set. I sold the Trinity 400 (despite explicitly mentioning it was a tricky board, the Tyan name helped shift it fast) and didn't look back.

The problems I had were almost all BIOS related. In particular, any hardware configuration change (such as inserting or removing a PnP PCI or ISA card) tended to trigger a CMOS checksum error, requiring a CMOS clear to get it back working again. But there were also resource conflicts (again PnP playing up, and sign of sloppy BIOS code) and detection issues.

Well SHIT. That is exactly what I got this board for, testing hardware and also testing software in different environments before I uploading it to an archive. I'm noticing the DFI TA64-B on Ebay is going for over 200 dollars, but there are some TA64-Bs by other manufacturers like ASUS that are much cheaper, maybe I'll look into those.

dionb wrote on 2020-09-24, 07:45:

You also have a floppy drive error. What's going on there? If FDD and HDD are failing, it sounds like your modular PSU isn't delivering power correctly to the molex. Check the voltages coming out of the molex connectors.

That might be the problem, however it's just saying that because no floppy drive currently installed. It worked before without one using the same PSU, and I plan to get one eventually, just not right now. Sorry, I should have mentioned that.

PC Hoarder Patrol wrote on 2020-09-24, 08:00:

Seems to be a board from an old MicronPC system - if you can, maybe try the latest Tyan bios (v1.07)

I take it that the MicronPC and Tyan bios are different?

AeonG wrote on 2020-09-24, 10:16:

[...]

Well SHIT. That is exactly what I got this board for, testing hardware and also testing software in different environments before I uploading it to an archive. I'm noticing the DFI TA64-B on Ebay is going for over 200 dollars, but there are some TA64-Bs by other manufacturers like ASUS that are much cheaper, maybe I'll look into those.

There's no such thing. If it's a TA64, it's not an Asus board. I just spotted two on eBay, they are just sellers unaware of what they are selling. Still massively overpriced IMHO. And anyway, before you spend a penny on other hardware, figure out exactly what is wrong here.

That might be the problem, however it's just saying that because no floppy drive currently installed. It worked before without one using the same PSU, and I plan to get one eventually, just not right now. Sorry, I should have mentioned that.

If it's saying that and there's no floppy, it means BIOS is not correctly configured. Have you actually configured IDE in BIOS?

AeonG wrote on 2020-09-24, 10:16:

PC Hoarder Patrol wrote on 2020-09-24, 08:00:

Seems to be a board from an old MicronPC system - if you can, maybe try the latest Tyan bios (v1.07)

I take it that the MicronPC and Tyan bios are different?

MicronPC referred to this board as the 'Tazer' rather than the Trinity 400, and it's unclear how different this OEM version might have been from the Tyan retail model, but the BIOS history is certainly different