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If you know the current administrator password, you can change it by going to System Preferences: Accounts. If you've lost the password, you need Disk 1 of the OS install disk set. Start up the computer and put the disk in the optical drive. Restart the computer and hold down the option key immediately after the chime until a disk icon appears on the display. Wait a few seconds more until the optical disk icon appears. Click on this, then on the arrow to boot up from the install disk. When the OS installer appears, go to the Reset Password... item in the Apple menu and follow the directions there. (Select the administrator account from the pull-down menu.) If your install disk is not specifically for an eMac, or is made for an eMac with a different graphics chip, the display quality may be poor, but you should still be able to pick out what you need to see from the Password applet.
Sometimes the word administrator can be used to bypass log ins apart from that there is software you can download to reset your password if you have forgotten it.
Google or you tube your problem to find the software.
If you hold down the mouse button, and then turn on the eMac, the drive will pop out, and you can put in a CD. Also, you can hold the F12 button to eject. Even if there isn't a dedicated Eject key on the keyboard, you can eject this way.
You should format the internal hard disk and install a clean and fresh version of Mac-OS anyways and create a new user-account. If there is no install-disc included, try calling Apple, tell them your eMac's serial number (All eMac's have their serial numbers printed inside the disc drive door), and ask them if they have any replacement install discs for your model of eMac. Check out the Apple eMac support page or the Apple eMac support forum for more informations.
In OS X, if you're the administrative (or only) user, you can reset the admin/user password using the OS X installation disk #1. Put the disk in the CD drive & restart the eMac while holding the "C" key down (Restart is also on the Apple menu, top-left corner of your screen). When the Installer opens, click "Utilities" then Restart. When the Installer asks you what language, pick one (maybe English?) 8¬), click continue (arrow) then Utilities again & choose "Reset Password"; the system will guide you through the steps. Once you've reset the user password, restart the eMac, then you can log in using the new password. You'll probably want to reset your "Keychain" password to match your new login password – otherwise it'll ask for your password every time it needs one for a program. "Keychain Access" is in the 'Utilities' folder, which is inside the 'Applications' folder.
—> Important: if the old Users Home Folder was encrypted ("FileVault" protected), you'll need the old user's password, or the eMac's Master password to access the files in the Home Folder – otherwise, the Home folder's files will be lost. As a new user, you'll have your own Home Folder & access to all application programs.
OK - first, crossover cables let you network PCs together without a switch or router. I would strongly recommend returning the crossover cable and buying a router so that you can use both computers on the internet at the same time.
Second, the eMac monitor can not directly be used as a monitor for your G4 - it's not built that way. However, you can use Screen Sharing on OS X (if both have Leopard) or Apple Remote Desktop software (if you buy it) to remote control the G4 using the eMac.
You will DEFINITELY need a monitor on the G4 in order to set it up at all, so I hope you have that.
Keep in mind that you can buy, for less than $200, an LCD screen that is larger and better quality than the eMac, and it would leave the eMac useful as a second computer. Since the eMac is unlikely to work at all with Leopard, and you'd have to buy Apple Remote Desktop, you're going to spend less money by buying a separate screen for the G4.
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