HT1420 I've not used my iMac for some time and the password has been forgotten.  How do I re-start?

I bought the iMac some 18 months ago and it was set up be a system administrator who has since left the company.  I want to start using it again, but no-one knows the password.
I've tried inserting the Install DVD but the system immediately asks for the original password.
How do I overcome this?

Hi Paulfromhkg,
Welcome to the Support Communities!
Your post indicates you are using Snow Leopard on your iMac.
The article below may be able to help you with this issue.
Click on the link to see more details and screenshots. 
Mac OS X 10.6: If you forget your administrator password
http://support.apple.com/kb/PH6317
Cheers,
- Judy

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