iMac not booting...probably due to changed permissions in Macintosh HD

[gnick]

my iMac is not booting past the grey screen(with this --->) . I am guessing that is because I did something stupid .. i changed the "Sharing & Permissions" section in my Macintosh HD Get info window. To be more specific, I changed the Everyone's permission to "no access". I tried booting with the Mac OS install disc and doing the HD recovery from the Disc Utility but it didn't changed anything. In fact there is an error every time I am trying to do "Repair Disc Permissions", while the action "Repair Disc" is completed with no problems.
I don't know what to do Please help if you know what I can do to fix this!!!

 

[old-wiz]

*NIX gives you plenty of room to screw things up quite badly. There are quite a few threads where people have monkeyed around with permissions or terminal without knowing exactly what they are doing and wound up with unbootable systems.

You will probably need to reinstall OSx to recover.