Use TechTool Deluxe with Mac OS 9. With Mac OS X 10.0, a variety of false "problems" are reported.
Symptom
After copying TechTool Deluxe to your Mac OS X 10.0 hard disk and opening it to test your computer, TechTool Deluxe generates a report with one or more false "problems".
Solution
Start up the computer with Mac OS 9 before testing with TechTool Deluxe.
For related information on TechTool Deluxe, please see article 25141: "Apple Protection Plan CD: Cannot Be Startup Disk on All Macintosh Computers"
Important: This does not apply to the dual system version of the AppleCare Protection Plan CD (Includes both Mac OS 9 and Mac OS X on a single CD). This CD contains a version of the TechTool Deluxe application that works correctly using Mac OS X. Follow the directions on this CD on how to run TechTool Deluxe for Mac OS X.