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Keeping your Mac firewall 24X7 also help keep safe. This can be done by clicking on System Preferences from the Apple menu of options. System Preferences, click the Firewall tab and click Start to activate it.
In addition to this, the user can continue to improve the physical security of your Mac with the security settings. Automatic login can be prevented and after sixty minutes of inactivity, the Mac can be set to automatically log out. Also, when the Mac is a screen saver or sleep, can be set to require a password to log in again All these features can be introduced an option by going to the Apple menu and select System Preferences and then click the Settings dialog protection.
password is another way to secure your Mac. Under Apple's option on the menu bar in System Preferences pane is an Account Preferences. This password can be changed and you can also build one if you can not think of a stronger you by clicking on the icon below. It is important to have a password to prevent brute force attacks.
The easiest way to ensure the security of the Mac operating system is updated with the latest security updates for Internet, going to the Apple Menu bar and select Software Update. Mac can also be set to automatically update software and monitor their daily, weekly or monthly, according to user preferences. URI site provides free McAfee VirusScan Antivirus downloads that can be updated periodically and automatically.
Could be as simple as you have the caps lock on, the password is case-dependent.
If not, you can reset your password by booting
up the mac with the system disk (usualy disk 1 of the instal disks supplied) hold down the c key on your keyboard
once it has booted up go to the menus and you will see a change the
password item, use this to change the password. Once you have changed it
quit out of the install disk and restart Hope this helps.
Insert your Mac OS disk into the cd drive and restart while holding the C key to launch the system on the disk instead of your hard drive. When you reach the desktop, look for the utilities menu and reset the master password. You shouldn't need the existing password to do so.
One of your keys is nonfunctioning
Your browser isn't up to date
For the key functioning, do a test of every key on your keyboard to make sure they all work.
For your browser, make sure that you're running the latest version of Safari. (Run Software Update by clicking on the Apple icon in the top left, then "Software Update...")
If all of your keys work, Safari is up to date, and you still have an issue - try running a different browser. You can pick up Firefox at http://www.mozilla.com/en-US/firefox/ or getfirefox.com