Hello,i have changed the access of library and system files in macintosh HD through get info option.i changed the access to write only access for library and system files to no access for everyone.then mac stopped working..nothing opening now.

hello
i have changed the access of library to WRITE ONLY and also i changed the access of system files to NO ACCESS FOR ANYONE in macintosh HD.then,suddenly it stopped working.i tried it shut down.then it didnot shut down.then i pressed ctrl+command+power button.then it was shut down.
NOW, nothing is opening in macbook pro.it is opening and only apple logo is shown.what should i do now.i knew nothing in mac.please help me.operating system is 10.7

hello CT,
it showed
permissions differ on library: should be drwxr-xr-r
repaired "library"
permissions differ on system: sholud be should be drwxr-xr-r;they are d-wx-----------
repaired "systems"
like this many steps occured.
then next step is permissions repair complete.

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