I changed the password from the root user - now: no booting up

Hey guys. Im a new "unix user" and I learned a lot about using terminal and stuff and a few days ago I changed my password and I forget it after. So I changed my password over the following steps: when it booted up, i pressed apple + s to go into terminal as "root" and than i did that after a online toturial .. Bad idea. The first time, when i tried it i did the following:
/sbin/fsck -fy
/sbin/mount -uw /
/passwd root
I think, that that /sbin/fsck -fy not important is, in order to change a password. But after i changed it a few times, my mac is not booting up anymore. If I exit terminal right out of the open terminal window (I type in exit) it starts something. And then it does a few things i will write them down here, that you an see:
i type in exit and than:
logout
jettisoning kernel linker.
resetting IOCatalogue.
Matching service count = 0
Matching service count = 1
Matching service count = 1
Matching service count = 1
Matching service count = 1
Matching service count = 1
Matching service count = 4
PowerBook5,8: stalling for module
Matching service count = 1
Dec 31 16:07:18 localhost directoryService[22]: Launched version 5.8.1 (v514.28)
UniEnet: Ethernet address 00:14:51:2f:8a
AirPort_Brcm43xx: Ethernet address 00:14:51;86:48:89
Dec 31 16:07:35 Ther-Rieken com.Apple.Launchd[1] (com.apple.mDNSResponder[27]): posix_spawnp("/usr/sbin/mDSNResponder", ...): No such file or directory
Airport: Link Down on en1
Airport: Linmk up on en1
Dec 31 16:07:35 Ther-Rieken com.Apple.Launchd[1] (com.apple.mDNSResponder[27]): posix_spawnp("/usr/sbin/mDSNResponder", ...): No such file or directory
Dec 31 16:07:35 Ther-Rieken com.Apple.Launchd[1] (com.apple.mDNSResponder[27]): posix_spawnp("/usr/sbin/mDSNResponder", ...): No such file or directory
Dec 31 16:07:35 Ther-Rieken com.Apple.Launchd[1] (com.apple.mDNSResponder[27]): posix_spawnp("/usr/sbin/mDSNResponder", ...): No such file or directory
Dec 31 16:07:35 Ther-Rieken com.Apple.Launchd[1] (com.apple.mDNSResponder[27]): posix_spawnp("/usr/sbin/mDSNResponder", ...): No such file or directory
...and so on ...
Thats it. Sometimes, it shows me the following error..
Error: apple8021Associate() failed -6
So I have to say something else, too. I did, because i was so scared a command, also from youtube, to restore your mac. I cant remember, how that goes. Something with applesetupdone and stuff. But That resets the Mac to factory settings. And my Mac used to run Tiger, i upgraded it. I thing, that caused a error in the system. Can i fix it ?? Im in really big kaka .. haha. I hope, somebody ere has experiences with that stuff. I hope, somebody is able to help me.
cheers!
Theo

Kind of what were were saying in [http://discussions.apple.com/message.jspa?messageID=13168794#13168794]

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I changed the password from the root user - now: no booting up

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