In trying to modify user permissions for network trouble shooting, I went into my Get Info option on my Macintosh HD and changed the permissions of "Everyone" from "Read Only" to "No Accesss". After doing that*, my Mac won't boot past the blue screen but will successfully boot in single user mode. To worsen things: *This is my only computer besides the public library. *I don't have install DVDs. Doing a fsck -yf did not solve the problem. Attempting to run diskutil gives an error message "unable to run because unable to use the Diskmanagement framework" "the diskarbitration framework beig unavailable to being booted in single user mode". So my question is: Is there a way to reverse the mess I made from single user mode?. I'll be searching the series of tubes for an answer but I'm also aware that there are some CLI gurus around here. Thanks a lot for your help.