A big box arrived by courier today:

Containing a lot of scrap I got off ebay, here's one of the listing's photos with most of the stuff visible:

At 120€ plus shipping it wasn't cheap, but I saw a couple things in there that I was really excited about. Still a risk, because the lot was sold as for parts only, but I figured some of it should work and some of it should be repairable. I've been sorting through the lot and doing some preliminary testing (just to see what boots up and what doesn't, without any additional troubleshooting what might be wrong). Here's the couple things I was most excited to try out:

Asus P3B-F, rev 1.01. I've wanted one of these for a while, but usual ebay prices are pretty crazy, when one even bothers to show up at all. This was one of the main reasons I went after this lot, so I was really hoping it would work, or at least be repairable. Turns out, it does work, it booted right up without issues 😀. Came with what turned out to be a Katmai Pentium III 450 and 3 sticks of memory, though one of them has one chip ripped off so it only recognises half of its 256 MB total capacity.

Next up, Gigabyte GA-586TX3. This was another one that caught my eye when deciding to bid on the lot. I have several socket 7 boards already, but all the ones I have with Intel chipsets are very basic. So a nice socket 7 board like this was high on my wishlist 😀. As luck would have it, this one too booted right up, after checking the jumpers were configured properly. Also, it turned out to come with a Pentium 233 MMX, which I have been missing in my collection and have been on the lookout to find as well. So double win.

Then I came upon this one. Not exactly retro and I must admit I didn't even notice it in the listing as anything noteworthy. Turns out it's a Fujitsu socket 1151 board with the C236 chipset, meaning it also supports Xeon CPUs. Unfortunately it didn't come with a CPU and I don't have any socket 1151 CPUs to test it with, so I don't know yet if it works.

Next up, crappy pic of what is the Asus A8N SLI. I've had the worst luck trying to find a working nForce4 board. I already have this board's sisters - an A8N SLI Deluxe and an A8N SLI Premium, neither of which works. Recently I picked up an ECS AM2 board with nForce4 for a couple €, which also turned out not to work. Maybe it's a curse or maybe nForce4 was a really unreliable chip. Either way, I really wanted to get a working one and finally I did, as this one booted up just fine 😀. Came with an Athlon 64 3200+, but I already have a couple 4000+ chips, so one will find its home in this board. It does need to be recapped though, before I use it again, as a couple caps are in really bad shape.

Again a board that's not exactly retro, but I also don't have any socket 1155 boards or CPUs, so getting one would be a nice bonus. This one also ended up booting without issues; and the CPU on it turned out to be an i5 2300, which was way better than I had expected. So another nice win. And as an extra bonus, it also came with two 2 GB DDR3 sticks.

Another not really retro board, Asus H81M2 for socket 1150, and another platform I didn't have any boards for, up until now. And again it turned out to work, though it was being a bit stubborn at first. Initially it kept complaining about USB device over current status detected, which caused it to keep shutting down and refusing to boot. Luckily I remembered dealing with this issue on another Asus board in the past, checked the manual and found the USB device wake-up jumper was missing. After fixing that, the board boots up just fine, with no complaining. And again the CPU on it turned out to be better than I had expected, an i5 5440.

I already have one of these boards, Asus P5Q, as well as its close cousin, the P5Q-E. All nice boards, P45-based, supporting all socket 775 based CPUs, with good overclocking support. Unfortunately this one doesn't boot up. Instead, it shuts itself off immediately after turning on, so I'm guessing there's a short somewhere. Doesn't exhibit that behaviour without the CPU installed, but that's as much troubleshooting as I was willing to put in at this point. Might be fixable, depending where exactly the fault turns out to be. Still, the awesome giant CPU cooler it came with actually makes up for the board not working. I only have one other decent cooler that fits on 775, so this one will find plenty of use.

Here's a bunch of various cards that were also in the box. Much more mixed success with these, than with the motherboards so far. The 550 Ti boots, but displays some artifacts in DOS mode, so will probably be the same in Windows and under 3D. Might be fixable though. The Matrox Millenium II doesn't get detected, so no boot. I have another identical one, so I'll try if at least the add-on memory board works with that one. The Mercury P64 is also no go, my test board wouldn't even turn on with it installed. Of the three ATI cards on the right, the top one (9200 LE) boots, but doesn't output anything on either DVI or VGA. The middle one, 9200 SE, works ok. The bottom one is a 9600 Pro, which I haven't tested yet. The passive card left of it is a useless Geforce 7300, but it does boot up fine so I can at least use it for testing PCIE based motherboards. The Audigy 2 ZS was a nice surprise, since I didn't even notice it in the listing, but I haven't tested it yet. And the pair of Adaptec SCSI controllers I have no way of testing, since I don't have any devices to connect to them. There's also a couple other cards still to try, a couple older ATI cards (Rage II, that sort of thing) and a few network cards.
Besides these pictured, I've already tried a few other motherboards. So far, all but the P5Q and one other board have booted up. There's two others that clearly have no chance of working, since one has suffered some catastrophic failure that left really bad burn marks on it and the other is missing the CPU socket. But so far, the success rate has been way better than I'd hoped for.