Leopard Won't start, I messed with permissions.

Hi! Ok, i have a Macbook Pro, the hard disk failed and i taken it to repair, a new hard disk was installed and they put all my old disk information in the new one. I was happy. I started to work and realized that every time I wanted to save a file in an old folder i had no privileges, Tired (instead creating a new account) i selected the hard disk, get info, and put read, write execute permissions to everybody, and press Apply to enclosed items (!!). Ok, everything was fine until i restarted. Eternal grey loading screen. I used disk copy, repaired disk and permissions, nothing, disk warrior, repair disk and permissions, both programs said to me everything was ok, but leopard wasn't booting. Then I found the Target disk Mode, I connected my macbook pro to my macbook pressed cmd and T and yes! the disk mounted and i was able to see it in my macbook. I was happy again.(since the macbook pro have very important files) I worked with some files in my macbook and i had an idea, in my macbook pro System folder, get info and put it as read only, i didn't think that work but when i restarted, the computer booted! I was happier than ever! and i started to think i was some kind of genius. Until i restarted Again. the macbook pro won't boot. Ok, no problem, i though, i will use target disk mode... pressed cmd T..nothing...errr, well, i will run disk copy from the cd....cmd C, nothing..diskwarrior, nothing, the only thing it let me, is cmd and S, single-user mode and i've been trying to fix it from there for two days now, i'm desperate. To clarify:
Things i tried till now:
Cmd + T: nothing
Cmd + C nothing with any cd
PRAM reset: yes, i done that.
cmd + SHIFT: i done that
and cmd + S, yes works everytime but i haven't the knowledge to fix it by myself, I tried many things i read from this boards and the internet but my computer still dead, if someone can guide me, i will be forever grateful. All the sudos, chowns, chmods i made, gave me a /System/Library/CoreServices//boot.efi: Operation not permitted
/System/Library/CoreServices//boot.X: Operation not permitted
Ok, i hope you can help me. Thanks

I just can't believe... I invented that i had to press the command key for Target disk mode or start up from the cds... I spend a whole day writing unintelligible (for me) lines of codes in single user mode just because i was pressing a wrong key, after i read a thousand times the list of start up keys options. I feel sooo dumb.
Well Steve, i have no words to thanks you, thanks you too Sherman.
I was able to save all my important files using target disk mode.
Then I repaired permissions using disk aid, leopard stills doesn't booting, but i really don't care, i have my files, i will try disk copy and if doesn't work, i will do a clean install, i will loose some settings, but no problem, it was a recent install anyway.
Thanks you all helping people!!

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Leopard Won't start, I messed with permissions.

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