Hi ! I want to help because

I opened my i Mac, clicked on Macintosh HD,clicked on permissions tab and I tried to "No access" of Macintosh HD after that my i mac went on no boot,I tried to in single user mode,nvram reset, safe mode and target mode but it didn't work.What should i do now because i don't want to lose my data.Please....

Hi Nick,
You'll have to use Single User Mode...
See this User Tip by Niel: I accidentally set a disk's permissions to No Access ...
If the disk in question is your Mac OS X startup disk and your computer stops starting up at the blue screen, restart with the Command and S keys held down, and enter the following commands:
mount -uw /
chown root /
chmod 1775 /
exit
https://discussions.apple.com/docs/DOC-2240

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