Old Intel 286 Motherboard Troubleshooting (Part 1)

I've built a 286 PC using old parts but found that my I cannot read any files off the hard drive over 1024 bytes. If you have experience troubleshooting old PCs, I would love any feedback you might have. Part 2 where I do more troubleshooting and find a drive that does work:    • My 286 Mystery Continues (Part 2)