Dell Latitude C840 User Manual Page 78
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- Table of contents
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Power Management
Management Tips
Power Management Modes
Power Options Properties
Management Tips
l Connect the computer to an electrical outlet when possible because the battery life expectancy is largely determined by the number of times it is
charged.
l Place the computer in standby mode or hibernate mode when you leave the computer unattended for long periods of time.
l To exit a power management mode, press the power button.
Power Management Modes
Standby Mode
Standby mode conserves power by turning off the display and the hard drive after a predetermined period of inactivity (a time-out). When the computer exits
standby mode, it returns to the same operating state it was in before entering standby mode.
To enter standby mode:
l In the Microsoft®Windows® 2000 operating system, click the Start button, click Shutdown, click Standby, and then click OK.
In Windows XP, click the Start button, click Turn off computer, and then click Stand by.
or
l Depending on how you set the power management options in the Advanced tab, use one of the following methods:
¡ Press the power button.
¡ Close the display.
¡ Press .
To exit standby mode, press the power button or open the display depending on how you set the options in the Advanced tab
. You cannot make the computer
exit standby mode by pressing a key or touching the touch pad.
Hibernate Mode
Hibernate mode conserves power by copying system data to a reserved area on the hard drive and then completely turning off the computer. When the
computer exits hibernate mode, it returns to the same operating state it was in before entering hibernate mode.
Your computer enters hibernate mode if the battery charge level becomes critically low.
Depending on how you set the power management options in the Advanced tab, use one of the following methods to enter hibernate mode:
NOTE: See "Using a Battery" for more information on conserving battery power.
NOTICE: If your computer loses AC and battery power while in standby mode, it may lose data.
NOTICE: You cannot remove devices or undock your computer while your computer is in hibernate mode.
- Notes, Notices, and Cautions 1
- Abbreviations and Acronyms 1
- About Your Computer 2
- Left Side View 5
- Right Side View 7
- Back View 8
- Bottom View 10
- Appendix 12
- FCC Notices (U.S. Only) 13
- Modem Regulatory Information 14
- Fax Branding 14
- IC Notice (Canada Only) 15
- CE Notice (European Union) 15
- CE Mark Notice 16
- New Zealand Telecom Warnings 16
- ENERGY STAR®Compliance 17
- VCCI Notice (Japan Only) 18
- Class A Device 19
- Class B Device 19
- BSMI Notice (Taiwan Only) 21
- Warranty and Return Policy 22
- Using a Battery 23
- Charging the Battery 24
- Removing a Battery 24
- Installing a Battery 25
- Storing a Battery 25
- Cleaning Your Computer 26
- Using Dell Diagnostics 28
- Advanced Testing 29
- Advanced Testing Help Menu 30
- Using the Display 32
- Reinstalling Software 34
- Using the Microsoft 35
- Windows 35
- XP Device Driver Rollback 35
- Using System Restore 35
- Creating a Restore Point 36
- Finding Information 38
- Fixing Problems 39
- Installing Parts 39
- Getting Help 40
- Problems With Your Order 41
- Product Information 41
- Before You Call 42
- Contacting Dell 42
- Glossary 51
- Dell™AccessDirect™Button 63
- Numeric Keypad 63
- Keyboard Shortcuts 64
- Touch Pad 65
- Track Stick 66
- Using the Module Bay 68
- Using the CD or DVD Tray 69
- Adjusting the Volume 69
- Passwords 71
- Using a Hard Drive Password 72
- Assigning an Asset Tag 72
- Deleting an Asset Tag Number 73
- Assigning an Owner Tag 73
- Deleting an Owner Tag 73
- Asset Tag Options 73
- Using PC Cards 75
- Removing a PC Card or Blank 76
- Power Management 78
- Power Options Properties 79
- Advanced Tab 80
- Hibernate Tab 80
- Intel SpeedStep®Tab 80
- Solving Problems 81
- Error Messages 82
- Video and Display Problems 85
- Sound and Speaker Problems 86
- Printer Problems 87
- Touch Pad or Mouse Problems 89
- External Keyboard Problems 90
- Unexpected Characters 90
- PC Card Problems 91
- Drive Problems 91
- Network Problems 93
- General Program Problems 93
- Error messages appear 94
- Windows XP 94
- A program stops responding 94
- A solid blue screen appears 94
- If Your Computer Gets Wet 95
- Adding and Replacing Parts 97
- Adding a Mini PCI Card 98
- Replacing the Hard Drive 100
- S-Video and Standard Audio 101
- S-Video and Digital Audio 102
- NVIDIA Video Controller 106
- Overview 108
- System Setup Screens 108
- Commonly Used Options 109
- Specifications 111
- Identifying Your Computer 115
- Packing the Computer 115
- Travel Tips 115
- Traveling by Air 116
- Help and Support Center 117
- Switching to Classic View 117
- Desktop Cleanup Wizard 117
- Program Compatibility Wizard 118
- Internet Connection Firewall 118
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