When you hit the clean button and check all the boxes, it will get half way through and the give a Kernel and freeze up the computer. Now I just tried using it again and just used the default, all went OK, I think. I then went to the maintenance button and ran that. All seemed to be OK. Then I noticed a real slow down of my system and of the internet connection. I worked all day yesterday with that. What I had to do was put in a new network location in system prefs. I had to use Apple disk utility to repair perrmissons, and that was after the OnyX perrmission repair that didn't work. I had to do a Pram Zap restart. Now I'm back to where I was before using OnyX just this last time. One other thing, I post AFTER chevyorange but his post keeps coming up as new. What kind of a HACK is that, NOT COOL. Must be from a red state.