Started having problems with Time Machine. Then Finder.app died. I got this message: "The application Finder.app can't be opened. -10810." As a result, I couldnt see any of my icons on my desktop, including my hard drive, and external drive, and had already replaced finder.app.plist and then found a fix by pasting this in Terminal: /System/Library/CoreServices/Finder.app/Contents/MacOS/Finder & disown This seemed to work, bringing my icons up, and all seemed well, and then I rebooted but have not been able to log back into system. None of Startup key combos work, at all. Only Single User mode, and I cannot load Install DVD either. Holding Option key allows me to connect to Airport?? and shows me an icon of my Hard Drive with an arrow beneath the icon. Clicking on the hard Drive starts up system, but again, hangs at blue screen. When I first rebooted after running Applejack, I got this message: Waiting for DSMOS... This, according to a reader, means "Dont steal Macintosh Operating System" and is Apple system proprietary software of some sort. This is not a stolen Mac Mini (late 2010) even though it is made in China. Seems like something Apple puts in its computers. I tried a fix by Carl Norton of Fix-KB.com, entering this string in Terminal: sudo chown root:admin / The returned message was: sudo: can't open /etc/sudoers: Resources temporarily unavailable I then tried to empty trash, a fix, : sudo rm -Rf ~/.Trash/* and got this message: "sudo: cant open /etc/sudoers: Resource temporarily unavailable." Then tried another fix: sudo audit -t I tried another repair by trying to delete Finder preferences in Single-User Mode: /sbin/fsck -fy Again, blue screen, so tried another attempt with : /sbin/mount -uw / And again, another attempt: rm /Users/shortname/Library/Preferences/com.apple.finder.plist and: rm /Users/shortname/Library/Preferences/com.apple.sidebarlists.plist I read that "A Safe Boot deletes the dynamic loader shared cache at (/var/db/dyld/). A cache with issues may cause a blue screen on startup, particularly after a Software Update. Restarting normally recreates this cache." However, I have done several Safe Boots, (Holding down the Shift key on reboot) and nothing happens. Shift, Command-V did absolutely nothing. In reading, it appears that the problem MAY be linked to "launch services in OSX" and in particular with Snow Leopard, which is what I am running 10.6.8, then I tried this fix, entering this string by Topher Kessler on CNET reviews. /System/Library/Frameworks/CoreServices.framework/Versions/A/Frameworks/LaunchServices.framework/Versions/A/Support/lsregister -kill -seed -rfv -all user, system, local This then spit out this: lsregister [OPTIONS] [ <path> ... ] [ -apps <domain> [,domain] ... ] [ -libs <domain> [,domain] ... ] [ -all <domain> [,domain] ... ] -kill Reset the Launch Services database before doing anything else (and then it continued to pump out what looked like instructions to the codes. I did a shutdown -h now, and then restarted and nothing happened, I am still stuck on a blue screen. I wonder if any of you have used these strings, which are supposed to repair the issues with "launch services:? rm -i ~/Library/Preferences/com.apple.LaunchServices.plist rm -i ~/Library/Preferences/com.apple.LaunchServices.QuarantineEvents rm -i /Library/Caches/com.apple.LaunchServices* The first command and second strings asked me for a confirmation so I entered "y" for yes, and it gave me: "rm: /var/root/Library/Preferences/com.apple.LaunchServices,plist: Read-only file system" I don't know if that means it removed them, and it is confirming, or if it is telling me it cannot remove them because they are read-only files? Entering the third string gave me "No such file or directory" I then rebooted to see if this had fixed my problem. It did not. I have noted that there are other issues: When i open Terminal, the prompt is no longer $, but is :/root#. I've been using Apple since 1986, and I have always been able to at least reboot or reinstall from startup disks, but not in this case.