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Hi. I assume that you didn't get any disks with it either. Taking full control without disks is tricky, however you can take majority control - as long as you know the admin password.
Open system preferences (under the Apple menu) and select USERS. You need to add a new user and to do that you have to unlock the padlock at the bottom-left of the panel that opens up. To unlock the padlock you need the admin password. Assuming you have it, click the padlock - endter the password and then you can add a new user. Make sure you set it so that the new user can ADMINISTER THIS COMPUTER. Create a new password for the new user. Then underneath the name of the original user you will have the name of the new user and in smaller letters underneath each name you should see "Admin" If you don't see admin under the new user go back and check the Administer bit - NOT Standard User. If everything is OK so far, look just above the pad;lock and you should see a small penel saying "LOG-IN OPTIONS". Click there and change the auto log-on to the new user name. Now close the windows (red button) and go back to the Apple Menu and select "RESTART" When the Mac retarts it should come up with a completely different desktop and very few icons. Go back to the USERS control panel and go through the same routine we just used to add the new user but this time delete the original user. You, the new user, are now in charge. You can download, install and do anything you want but the computer may still appear on a network as "Old user's Co,mputer" To change the default browser, open Safari, go to Safari preferences and change the setting there. It's an odditty that Apple put the setting there - but there's nothing wrong with Safari as the default. If you don;t know that Admin password you will need an Installation CD/DVD in order to change it.
You don't need the admin password to restore a Mac from its installation discs. Insert the disc, then hold down the C key as you are starting up, to boot from the disc instead of the hard drive. Continue with complete restoration of the original machine contents.
Strong Warning: You should only enable root if you really really
need it, really know what it's for, and realize the security
implications of enabling root! You can do everything you need to do
with "su do", so root is really not needed ... with that said, here's
how to enable it - please understand what you're doing and why before
you do this!
The "root" user (also known as the superuser) is the most powerful UNIX
account. The root account can do anything to any file or folder,
anywhere on the system. For that reason, it's considered quite
dangerous, and only needs to be used (occasionally) by advanced users.
Because of the dangers of operating as root, Apple has chosen to hide
the root account in OS X Final. However, there are a number of ways to
enable it. The easiest is to boot off the install CD, and look under
the Install menu for the "Password Reset" option. You can use this to
change your own password if you forget it, and to enable the root
account. This utility will not run if you copy it to your hard drive! It only works when booting from the CD.
Try hitting the ENTER key when prompted for the password. Let us assume the seller was kind enough to remove the password before selling the Mac. If you are not in luck, try borrowing a System disk from a friend (most Mac Users are really friendly), and maybe they offer you a copy of the CD/DVD. After booting from the CD, you can reset the password easily.
when booting in os x after the first boot chime immediately hold down keys <apple,option,o,f> all at the same time and allow computer to boot to open firmware once there type "reset-nvram" exactly like that but without quotation marks and press enter once it returns to command prompt type "reset-all"and press enter (you must have the "-" in between the commands) the computer should restart if not when the command prompt returns type "reboot" and hit enter .....
also you can check the drive status by going to "system profiler" in apple drop down menu--->about this mac-->more info or applications folder-->utilities folder--->system profiler then selct disk burning under hardware in the list on the left
Try to remove all traces of the fool proof thing. There is probably a system extension, a control panel, and pref file to throw away but BE CAREFUL, the system could have been set up prior so that Fool Proof has to be disabled through it's control system before you uninstall. I have seen people try to remove the before mentioned elements and it only exacerbates the problem. Your best be it to track down those system disks and reinstall the OS. You could upgrade the system to 1GHZ system and run at least OSX Tiger on it. Checkout Otherworld Computing for parts (www.macsales.com)
Install a new OS. Insert OS X disc while holding down the "c" key on the keyboard. This should open the installer on the OS X disc. Do a "clean install". When the installation is finished and you are up and running, reinstall your other software. This should only take an hour or two depending on your computer. Now you have your own OS that is not cluttered up with another persons ****.