
| • | The secondary battery or any other optional device | • | Cables that connect external devices through the I/O | ||||||||||||||||||||
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 | panel on the back of the computer. | ||||||||||||||||||||
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| options bay release | battery | 
Figure 3-3.  Checking an Optional Device
| serial port | monitor | keyboard/mouse | 
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 | connector | connector | 
Figure 3-4.  I/O Panel Connectors for External Devices
Look and Listen
Looking at and listening to your computer is important in determining the source of a problem. Look and listen for the indications described in Table 
If the problem is still not resolved, see the next sub- section, “Setup Options.”
NOTE: Before you begin any of the troubleshooting pro- cedures, make sure the Quiet Boot option is set to Disabled in the Main menu of the Setup program. See Chapter 2, “Customizing System Features,” for informa- tion on using the Setup program.
| Troubleshooting Your Computer |