Problems with osx. HELP!!!

[jaxxe]

I got this Mac pro with osx. It's a old bussines computer, so i don't have the log-in password for the user or administrator. I had this instalation CD, and it worked fine when i tried holding "c" down while restarting the computer. But i couldn't fix the problem at the moment so i turned it of again. Now it won't start up as usual with the " choose language menu " so i can't get acces to the computer. I really don't know why it does it, and i'm so lost right now.
How do i get acces to the computer now, and reset the computer and password?

- im from Denmark, sorry for my bad english, any questions, just ask me.

Thank you!

 

[simsaladimbamba]

To reset any account password via the Installation DVD: http://support.apple.com/kb/ht1274

To reset any account password without the Installation DVD: http://gigaom.com/apple/reset-os-x-password-without-an-os-x-cd/

To Erase & Install Mac OS X (10.4 Tiger or 10.5 Leopard): http://macs.about.com/od/leopard105/ss/installleopard.htm

To Clean Install Mac OS X 10.6 Snow Leopard: http://macs.about.com/od/snowleopardmacosx106/qt/cleaninstall_sl.htm

Or can't you boot into the Installation DVD via "C" or the Option/Alt key anymore? And what exactly does it say on the CD/DVD you have?

 

[jaxxe]

Okay, i couldn't reinstal, and i needed a keychain password to make a new account, and i don't have that. So i tried through the terminal with the code that makes u'r mac think that it should restart like a brand new computer right out of the box(1).
But, now the old user is still there but a new one that says " Another user "
I click on that one, i need a name and password to log in, but i don't have any user, i wan't to make a new one instead

(1)http://www.youtube.com/watch?v=e6ApGKYICes&feature=fvw

 

[simsaladimbamba]

What does the installation DVD/CD say on its surface? If you don't need any data stored on that Mac (meaning on the HDD Mac OS X is installed onto), then a Clean Install (10.6) or an Erase & Install (10.4, 10.5) will get rid of all the junk you seem to have problems with.