First one I remember was a beige tower and similarly beige CRT my dad brought home from his office since he bought a new tower. It ran Windows XP, but barely. Spent a lot of time on homestarrunner.com, addicting games.com, and other flash game sites since I had no money for actual games and I already beat all the games on my Gameboy.
Archive version: https://web.archive.org/web/20240809125525/https://www.wired.com/story/amd-chip-sinkclose-flaw/