Lost/forgotten administrator password

I have just bought a new imac and given my old one to my son. He reinstalled Leopard and has got everything up and running but whenever it asks for the administrator name and password it doesn't accept anything we put in.
We have tried my old name and password from before I gave it to him and we have tried his name and password from the account he has set up - which doesn't seem to be an administrator account. He is adamant that he hasn't changed any other passwords or anything but we don't know what to do now. If we try and re-install Leopard again it asks for the administrator name and password !
Is there anything we are missing like a start up default name and password (we have tried 'admin' and 'admin' or failing that do we have to reformat the whole thing and rebuild it from scratch?
Any thoughts welcome.
Thanks
David

Now that's exceedingly weird, A computer that won't start up from the install disk. Cobbyco, after trying Monty's suggestion, putting the install dvd in, turning the computer off, waiting a few seconds, then holding down the C key and pressing the power button, are you continuing to hold down the C key or letting go right away? I usually continue to hold down the c key at least til the screen lights up, that way I'm sure the install disk is the one starting the computer up. The more knowledgeable folks who have replied may think that's unnecessary, to hold the c key down that long, but it's just my own habit. Try it, might work for you too.
Message was edited by: TNJim

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The best way is to reinstall Win 7. We can't help you with a lost password beyond that option.
You can, however, run Google search for a solution.
Please click the "Thumbs up + button" if I have helped you and click "Accept as Solution" if your problem is solved.
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Log in.
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Hello,
I have a new IBook since Christmas. I did choose an administrative password, but it seems I typed it wrong : I cannot find it any more. I'm surprised because the hint question I left is very clear, but well, I guess it can happen. Of course, I tried all the ortograph versions I could think of and none works.
How can I re-initiate this password ?
Thanks in advance
Lise

Hi
Thanks for your answer !
I checked on the article and selected the 'change administration password' paragraph. I followed the instructions, but it seems the CD does not launch itself automatically as it should. What should I do ? I did not have to install the OS the first time, it was already installed.
I also checked if it was an AZERTY/QWERTY keyboard problem but it's not. I also tried any variations that came into my mind with the Shift button on and off but it does not work.

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