I installed Leopard after a fresh install of my Macbook Pro discs. I have a Macbook Pro 2.4ghz with 2gb of ram and a 160gb 7200rpm hard drive. Anyway, while on Tiger I would want to close my computer and put it away in my bag, instead of turning it off I would just close it and it would go to sleep. After installing Leopard, everything worked fine, but my sleep mode when I closed the lid. It would go to sleep for about 30 seconds and come right back out. So I uninstalled Leopard formated and re-installed Tiger, my sleep mode works again. I dunno whats up with Leopard, but I was on the phone with Apple Care for about an hour doing everything they told me to do, and nothing worked. I enjoyed Leopard, but I also enjoy using my Macbook Pro the way it was supposed to be used. This sucks, anyone have the same issue? Any help?