Hi all, I've been having freezing issues with OS X Leopard 10.5.3 that have been happening since 10.5.0. Every day (not exaggerating - literally every day) my Mac freezes for about 15 seconds, unfreezes for about 5, and then freezes again for 15, etc. Here is a video of this basically happening: http://www.viddler.com/explore/markbao/videos/6/ I can move the mouse, but clicking and keyboard usage is backed up, such that if I keep typing when it is frozen, it will show what I have typed when it unfreezes. Activity Monitor always shows kernel_task as the problem, taking up the entire CPU when it is in these 15 second freezing cycles, which doesn't really help. Sometimes this goes on for about 10 or so cycles and then it just completely freezes, sometimes it's completely frozen after just one. In either case, the only way to fix it is to force restart, as I had done in the video. Specs: MacBook Pro 15.4" 2.4GHz Penryn (Early 2008) - No, I do NOT have Parallels installed. OS X Leopard 10.5.3. Apple Hardware Test passed, no issues. Any ideas? Thank you!