Put your PC into a slick ATX case

Detach your old PC from its power and peripheral cables, and if it's a tower-style model, lay it flat. Remove the side panel, touching the chassis to discharge any static electricity.

First, label all interior cables (barring those connected to the case) to make reattachment easy. Our preferred method: Post-its. Everywhere a data or power cable plugs into a component, record on a Post-it which component the cable plugs into. Wrap it around the cable beside the connector, taping to secure. Flag both cable ends and any connections in between.

Replace IDE and floppy ribbon cables with rounded cables ($5 to $10 from ATX enclosure (such as the Vantec and others). They are easier to route, look better, and improve airflow.