I apologize in advance if posted in the wrong sub-forum [mods' please adjust if needed] OK, I'm unable to update from 10.6.4 Snow Leopard to the 10.6.5 Security Update - either from built-in Software Update, the downloaded 10.6.5 Combo update, or the full 644MB OS X 10.6.5 Update. Using Disk Utility to Verify or Repair Disk Permissions I see the error - "Warning: SUID file "System/Library/CoreS... as been modified and will not be repaired". Also my Mac Mini 2.0Ghz 4GB RAM, 320GB HDD is pretty much on 24/7 and I've rebooted several times after each attempt listed above and running Disk Utility before each reboot and before each attempt. An aside to this ... I'm unable to use the numeric keys above the keypad on my Apple Keyboard Pro [aluminum] for the past 20days. Yes I've checked System Preferences: Keyboard: Restore Defaults, Full keyboard access = All Controls, Modifier keys = [only Apple Keyboard is selectable], and I've restored defaults, Expose Fkeys have been removed [tried and set back to no avail]. Lastly, I'm unable to use the powered USB ports on my Dell monitor which worked just a few days ago before my wife moved around the desk - doubtful she would've damaged anything [she knows I'm anal about the Mac - I work with PCs]. I'm unsure if all are related and I DO recall having to do the 10.6.4 Combo update from the original shipping Snow Leopard. Have I missed anything to test? Any help would be appreciated as this is the family Mac - wife and kids rely on this.