Daniel Carter said: >I've kept Tiger in its box for weeks and weeks now. >how best to get from OS 10.1.5 to Tiger? Have a look at this $5 electronic book: Take Control of Upgrading to Tiger http://www.takecontrolbooks.com/tiger-upgrading.html There is a free downloadable 27-page PDF sample of the book, with Table of Contents, Introduction, Quick Start, and section starts. You can download the free sample directly from: http://www.takecontrolbooks.com/samples/TCoUpgradingTigerSample-1.0.pdf Randy B. Singer Co-Author of: The Macintosh Bible (4th, 5th and 6th editions) Routine OS X Maintenance and Generic Troubleshooting http://www.macattorney.com/ts.html