For those who responded to my query regarding the upgrade to Leopard and HD sleep mode issue - a big thanks. I did look at the Console log and saw that there were problems, however I didn't know how to address those items (much less how to trace them back to the problem based on the log info). John B. mentioned the system.log, but I couldn't find that item (even with a search - probably used wrong name). Again I'm not that savvy about Macs, nonetheless I really appreciate all the input. Anyway, I decided to reinstall using the Archive and Install mode (which was one of 2 options instead of 3) as a result of what I saw in the Console. That solved my sleep mode problem and the console log doesn't indicate error or execute problems. BTW, once I determined the system was functioning correctly I trashed the folder containing the previous system. Thanks again and I think this listserv is fantastic! Rob