I got a Compaq Deskpro ENS/P600 (the EN SFF [for "Slim Form Factor"] series) without a hard drive and neglected in a very dusty business environment.

I gambled on a small SSD and a SATA to desktop IDE adapter, cleaned everything inside and out, and installed the SSD. The Windows 98SE install CD recognized it.

I had to spend an entire evening locating the relevant Softpaq files (only four out of a few dozen thousand with cryptic names).