I performed the iBook Hardware test last night, but I have been using my computer for 6 months, but I was reading here last night about Mac Maintenance. Anyway, once the test got to the Memory check, the time was reaching about 18 mins, and the test said it would only take about 4-8 minutes, or longer with more Memory. I do have 640 MB of memory, but I don't think that would take 18 mins of the test, so I quit the test, so it didn't even complete.