Lost Passord after reinstall?

[TheMechanic]

Hi everybody!

I have a Macbook with Leopard on it with only one account. Yesterday I wanted to make a fresh install of Leopard because the 10.5.4 update was out. So I made sure that everything is backed up and put the first Install Disk in my MB. I choose the Archive and Install option. (btw I know that "Archive and Install" creates a "Previous" folder and puts the old system files in it but what happens with the application folder?)
After the installation was completed and the computer booted up again it brought up a login screen and ask me for my password. So I typed in my password (which is the administrator password, 'cause I have only one account). But it was the wrong password, at least it seems so, because it prompts me for the password again after it wobbles a bit.
I know that I typed the right password. I also tried all other passwords that I use but nothing changes.
What happend here? Am i stupid and always type the wrong password? Or went something wrong? What can I do now?
It is kind of annoying 'cause my Mac is basically useless now!

Your help is very appreciated!!
Thank you in advance!!

 

[CLuv]

Same thing happened to me when I did a reinstall for my parents. All you ned to do is boot off of your Leopard Install Disc, and under Utilities find Reset Password.

 

[TheMechanic]

Thank you for your help!

I already tried to boot from the Install Disc but there was also a login screen. So that doesn't help me.
But I'll try again...

...but wait! Do I have to press a key while booting? Or does it automatically boot from the Disc?

 

[rmb7984]

I had the same issue. Curious. You have to hold down the "C" key while booting with the disk in the drive.

 

[TheMechanic]

Thanks a lot guys!

It is working again now. I forgot that it is the "C" key that I have to hold down.

 

[CLuv]

Glad to hear that helped. Don't know what causes it, but at least there is a fix.