Yeah I guess trial and error works, but was hoping for something a little more straightforward. Power button isn't an issue as there's a separate 2-pin header for 'remote power' which has the same functionality, but reset and hdd/power leds... no idea currently. Reset switch is particularly useful to have on the occasions when Win98 goes a bit funky and/or you have a cd spinning in the drive and it won't let you eject.
I think I'll probably have a go at replacing them in the coming weeks (is there a reputable source for genuine branded caps like Rubycon etc?). Will give the board a quick test to bios before buying anything though, should be able to at least get that far...
After thoroughly inspecting the board there are in fact two caps that need replacing, and they're both next to each other with the same rating (1500uf, 6.3v). I missed the second one because the bulge on the top is very subtle compared to the obviously failed one. Every other cap on the board seems fine, including those in close proximity to the failed ones (although they are rated for higher capacity and/or voltage so that may be why). To be honest before bidding on the listing I did spot the one that looked iffy in the photo, but wasn't sure if it was just the lighting (pics weren't the best). Hey ho.
As for value, not sure really? Problem is anything that says 3dfx tends to be listed at silly money now, and a lot of sellers on eBay try their luck with stupid prices. There's an identical board to the one I just bought where the seller wants 500 us dollars for it, which is just ridiculous. The seller I bought mine from didn't appear to know what he had though, as it was just listed as a vintage slot 1 motherboard with a P3.
