First post, by y2k_survivor
I've been working on a Win2k/WinXP build based on a Tyan S1834D dual Slot 1 motherboard (this has the VIA Apollo Pro 133A chipset). Currently installed are: 2x512MB PC133 SDRAM, 2x Pentium II (Deshutes) 350 MHz, and a GeForce4 Ti4600 in the AGP 2.0 (x4) slot. (I realize that this combination makes no sense at all; the CPUs came with the board and are temporary.) The problem I'm having is that the computer constantly hard freezes; no error messages, no BSOD, it just seizes up completely.
In experimenting with different configurations, BIOS settings, and operating systems, what I've consistently found is that having PCI cards installed seems to be what is causing the computer to freeze. I've got several cards:
- An SB Live! (CT 4760)
- A gigabit ethernet card (RTL8110SC chipset)
- A USB 2.0 card (VIA VT6212L chipset)
- Onboard USB 1.0 ports (not technically a PCI card, but presumably runs off the PCI bus; can be enabled or disabled through BIOS configuration)
I've found that stress testing the CPU, memory, and AGP graphics card without any PCI cards installed does not appear to trigger any crashes, even when running overnight. However, if PCI cards are installed, a crash will typically occur within a few minutes. The exception is the ethernet card, which for some reason seems to have a minimal impact on the stability of the system. I can even reproduce this pattern when booting into an Ubuntu live CD, which would seem to rule out any explanations other than hardware.
It's worth noting that, until the system crashes, the cards all work fine. Audio, network access, and USB mass storage all work fine, with no issues reported through Windows (or Ubuntu).
Other observations:
- The capacitors on the motherboard all look okay. No signs of bulging, leaking, or corrosion.
- I used a Fluke 87V true RMS multimeter to check for voltage fluctuations coming from the PSU (a Seasonic SS-300FS Active PFC). All of the major rails (+5V, +3.3V, +12V, -5V, -12V) appear to be highly stable under load, well within the usual +/- 5% tolerance.
- I have a Coppermine Pentium III 1GHz (model SL4BS), but the motherboard does not POST with it installed, even after patching the BIOS to add the microcode updates for that model.
- Disabling ACPI and reinstalling Windows XP appears to have no effect. Additionally, using the USB 2.0 card without ACPI appears to be impossible.
- Running BIOS Patcher 4.23 and flashing the BIOS has no effect. The motherboard came with BIOS version 1.05 installed, and the only other version available from Tyan's FTP server is 1.03C.
- According to the manual, the motherboard supports PCI 2.2.
I'm basically wondering if there's anything else I can do to confirm this diagnosis, and whether anything can be done to repair or salvage the motherboard.