Didn't get to do as much as I had hoped on the weekend, but I have some non-interesting photos and some story to tell at least.

A syringe that cost me $4 delivered, to fill the loop.

850 EVO 120GB to install Windows on. Finally got it back. Formatted it to FAT32, aligned everything, should be good to go, right? Wrong!

Off to a good start.

NOPE!
I tried a couple of times, and it always resulted in a BSOD and then that. I moved PCI slots around, I moved SATA ports around - still the same. Changed the CPU back to the old one - same. Changed RAM - same. Changed GPU - same.
I was getting frustrated. Reset the BIOS - same.
It was decidedly a good time to go investigating further. I know it worked fine installing on my IDE hard drive back when I was originally testing the motherboard, so I installed Win98SE again on that. No issues.
I thought the SATA controller just might not like this board, which was worrying. There aren't many affordable PCI SATA controllers with a built in BIOS. I didn't want to have to go through the whole motherboard bios editing to load a SATA Controller BIOS while replacing the logo or something. At this point I thought it was best to take a break and think about options. I loaded up some Quake III and fragged away against bots while pondering the situation. About an hour later, I decided to go and look through all the BIOS settings, one by one to see what may cause an issue.
I gave it a new CMOS battery just in case - even though I replaced it when I got it. Virus Scan was enabled, and I know that can cause issues writing to MBR, so I disabled that. PnP OS was disabled, so I enabled that. I set the date correctly. I tried once more and it seemed to work. I didn't keep my hopes up though.
It copied the files in no time at all - as expected with an SSD. It didn't get this far, so that was nice. I was dreading the restart, but it survived the restart. CD Key entered and details filled in.

I was cautiously optimistic. Another restart.

I still didn't trust it. I restarted the computer a number of times, and it always seemed to work.
At this point I'd been trying to get it installed for six hours, something that should have only taken 20 minutes if I had just checked over BIOS settings in the first place. I didn't feel like doing anything else hardware or software related at this point, so I went back to working on another retro project.
I'll do more later. I just don't want to look at this damn PC again for the rest of the day. 😵