Đăng nhập tự động: Đây là phương pháp thuận tiện nhất đăng nhập nhưng không cung cấp gì về an ninh. Tiger tự động đăng nhập vào tài khoản quy định khi bạn khởi động hoặc khởi động lại máy Mac của bạn. Tôi đề nghị bạn sử dụng đăng nhập tự động chỉ khi bạn máy tính xách tay là ở một vị trí an toàn (hoàn chỉnh với một khóa cáp, bao phủ trong Chương 1) | 304 Part VI The Necessary Evils Troubleshooting Upgrading Maintaining Why is rebooting so darn effective Rebooting fixes problems because it resets everything. Your network connection for example may be acting up or may have timed out and rebooting restores it. Rebooting also fixes problems due to brownouts or those notorious AC power flickerings that we all notice from time to time. Such interruptions in constant juice may not bother you or me or your less-intelligent toaster but they can play tricks on your Mac that rebooting corrects. Startup keys Table 19-1 provides the lowdown on startup keys. Hold the indicated key down either when you push your Mac Power button or immediately after the screen blanks during a restart. Table 19-1 Startup Keys and Their Tricks Key Effect on Your Mac C Boots from the CD or DVD that s loaded in your optical drive Media Eject Ejects the CD or DVD in your optical drive Option Displays a boot menu allowing you to choose the operating system Shift Prevents your login items from running T Starts your laptop in FireWire Target Disk mode Ô V Show Mac OS X console messages Ô S Starts your laptop in single user mode Ô Option P R Resets parameter RAM PRAM Some of the keys in Table 19-1 may never be necessary for your machine but then again you might be instructed to use them by an Apple technician. I ll warrant that you ll use at least the C startup key fairly often. Using Disk Utility to squash problems Tiger s Disk Utility is a handy tool for troubleshooting and repairing your hard drive. You can find it in the Utilities folder in your Applications folder. Fire up Disk Utility click the First Aid tab and you see the powerful looking window shown in Figure 19-1. Chapter 19 When Good Mac Laptops Go Bad 305 Figure 19-1 The physician of hard drives Tiger s Disk Utility. In the left column of the Disk Utility window you can see The physical hard drives in your system the actual hardware The volumes the data stored on the hard drives A volume
