How can i reset my computer password

my friend hired a company to setup het imac
her network password and all passwords for  extreme etc were set by them
they have since gone out of business, and she has no way of retreiving the passwords
she always relied on them
i have tried to look thru the keychain but it is either no help or i am missing the info that is suppose to be there
is there any other way to retreive or any easy way to reset the passwords
for an example her extreme needs a firmware update and without password..isn't going to happen
any ideas apeciated

You didn't mention what Mac or version of OS X she has, but generally, for versions earlier than 10.7, you need the original installation disk (CD/DVD) or a compatible retail version of OS X. Boot from the disk by holding down the C key (or Option key if that doesn't work) while you restart; use the Utilities menu from the installer to reset your password.
If it's a 10.7 installation, you can hold down command-R to boot from the recovery partition and do the same thing there.
Matt

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