IMac won't startup from disk

After start-up issues, Apple replaced the hard drive on my iMac.
After getting it back today, I restored my files and settings from my last Time Machine backup.
However, after restarting it would not accept my password.
However, when I try to boot from the leopard disk, A circle-cross symbol appears instead of the usual apple one. Thus, I have no chance to reset the password. This cross symbol, with the spinning one beneath it, just goes on infinitely.

Try this.
1: Turn the machine on.
2: Hold down the Apple and S keys (this starts the machine in single user mode)
3: What to see the root prompt (hit the Return key a few times to make sure initialization is complete)
4: Type the following command followed by the Return key (see general warning below)
mount -uw /
5: The above command mounts your file system as modifiable
6: Type the following command, replacing shortname with your actual short name, followed by the Return key. Follow the prompts
passwd shortname
7: With the password reset, enter the following command followed by the Return key
reboot
Note 1: Your keychain may not unlock. Unlock it manually and then reset the password.
General warning: Single User Mode is all powerful and a mistake could result in loss of data, loss of function, or permanent damage to the operating system. Be careful. I am not responsible for any damage you may cause Research the information above if you have distrust.
Oh, and please, no debates about "security holes." This is a normal function of the machine and there are methods to prevent it.
Hope this helps.

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