Home » HP Manuals » Laptops » HP ProBook 4540s » Manual Viewer

HP ProBook 4540s HP Notebook User Guide - Linux - Page 56

Resolving a low battery level, Resolving a low battery level when external power is available - wireless not working

Add to My Manuals
Save this manual to your list of manuals

Page 56 highlights

Resolving a low battery level Resolving a low battery level when external power is available ▲ Connect one of the following devices: ● AC adapter ● Optional docking or expansion device ● Optional power adapter purchased as an accessory from HP Resolving a low battery level when a charged battery is available 1. Turn off the computer or initiate Hibernation. 2. Replace the discharged battery with a charged battery. 3. Turn on the computer. Resolving a low battery level when no power source is available ● Initiate Hibernation. ● Save your work and shut down the computer. Resolving a low battery level when the computer cannot exit Hibernation When the computer lacks sufficient power to exit Hibernation, follow these steps: 1. Replace the discharged battery with a charged battery, or connect the AC adapter to the computer and to external power. 2. Exit Hibernation by briefly pressing the power button. Conserving battery power ● Turn off wireless and local area network (LAN) connections and exit modem applications when you are not using them. ● Disconnect unused external devices that are not plugged into an external power source. ● Stop, disable, or remove any external media cards that you are not using. ● Decrease brightness. ● Initiate Suspend or Hibernation, or shut down when you are not using the computer. Storing a battery CAUTION: To reduce the risk of damage to a battery, do not expose it to high temperatures for extended periods of time. If a computer will be unused and unplugged from external power for more than 2 weeks, remove the battery and store it separately. To prolong the charge of a stored battery, place it in a cool, dry place. 46 Chapter 6 Power management

Section	Page
Welcome	11
Finding information	12
Getting to know your computer	14
Top	14
TouchPad	14
Lights	15
Buttons, speakers, and fingerprint reader (select models only)	17
Keys	20
Front	22
Right	23
Left	25
Display	27
Bottom	29
Identifying the bottom parts of the computer	30
Networking	32
Using an Internet service provider (ISP)	33
Identifying wireless and network status icons	33
Creating a wireless connection	33
Turning wireless devices on and off	33
Using the wireless button	33
Using the operating system controls	33
Using a WLAN	34
Connecting to an existing WLAN	34
Setting up a new WLAN	35
Protecting your WLAN	35
Roaming to another network	36
Using Bluetooth wireless devices (select models only)	37
Connecting to a wired network	37
Connecting to a local area network (LAN) (select models only)	37
Keyboard and pointing devices	39
Using the keyboard	39
Identifying the hot keys	39
Using keypads	40
Using the embedded numeric keypad	40
Turning the embedded numeric keypad on and off	40
Switching key functions on the embedded numeric keypad	41
Using the integrated numeric keypad	41
Using an optional external numeric keypad	41
Using the TouchPad	42
Turning the TouchPad off and on	42
Navigating	42
Selecting	43
Using TouchPad gestures	43
Scrolling	44
Pinching/Zooming	44
Setting pointing device preferences	44
Multimedia	45
Using the audio features	45
Adjusting the volume	46
Checking your audio functions	46
Using the Webcam (select models only)	47
Using video devices	47
VGA	47
HDMI	49
Configuring audio for HDMI	49
Power management	50
Shutting down the computer	50
Setting power options	50
Using power-saving states	50
Initiating and exiting Suspend	51
Initiating and exiting Hibernation	51
Using the Power icon	52
Using power management	52
Viewing the current power management settings	52
Changing the current power management settings	52
Using battery power	52
Displaying the remaining battery charge	53
Inserting or removing the battery	53
Charging a battery	54
Maximizing battery life	55
Managing low battery levels	55
Identifying low battery levels	55
Resolving a low battery level	56
Resolving a low battery level when external power is available	56
Resolving a low battery level when a charged battery is available	56
Resolving a low battery level when no power source is available	56
Resolving a low battery level when the computer cannot exit Hibernation	56
Conserving battery power	56
Storing a battery	56
Disposing of a used battery	57
Replacing the battery	57
Using external AC power	57
Testing an AC adapter	58
Drives	59
Handling drives	59
Using the optional security screw	60
Removing or replacing the service door	60
Removing the service door	61
Replacing the service door	61
Replacing or upgrading the hard drive	63
Removing the hard drive	63
Installing a hard drive	65
Using optical drives (select models only)	67
Identifying the installed optical drive	67
Inserting an optical disc	67
Tray-load	67
Removing an optical disc	68
Tray-load	68
When the disc tray opens normally	68
When the disc tray fails to open	69
External cards and devices	70
Using Media Card Reader cards (select models only)	70
Inserting a digital card	70
Removing a digital card	70
Using a USB device	71
Connecting a USB device	72
Removing a USB device	72
Using optional external devices	73
Using optional external drives	73
Memory modules	74
Security	77
Protecting the computer	77
Using passwords	78
Setting passwords in the operating system	78
Setting passwords in Computer Setup	78
Managing a BIOS administrator password	79
Entering a BIOS administrator password	79
Managing a Computer Setup DriveLock password	80
Managing a DriveLock password	80
Entering a DriveLock password	80
Using Computer Setup Automatic DriveLock	81
Managing an Automatic DriveLock password	81
Using firewall software	82
Installing an optional security cable	83
Using the fingerprint reader (select models only)	84
Enabling fingerprint authentication during logon	84
Enrolling your fingerprint	84
Backup and Recovery	85
Performing a system recovery	85
Backing up your information	86
Computer Setup (BIOS) and Advanced System Diagnostics	87
Starting Computer Setup	87
Using Computer Setup	87
Navigating and selecting in Computer Setup	87
Restoring factory settings in Computer Setup	88
Updating the BIOS	89
Determining the BIOS version	89
Downloading a BIOS update	89
Using Advanced System Diagnostics	90
MultiBoot	91
About the boot device order	91
Enabling boot devices in Computer Setup	92
Considering boot order changes	93
Choosing MultiBoot preferences	94
Setting a new boot order in Computer Setup	94
Dynamically choosing a boot device using the f9 prompt	94
Setting a MultiBoot Express prompt	95
Entering MultiBoot Express preferences	95
Troubleshooting and support	96
Troubleshooting	96
The computer is unable to start up	96
The computer screen is blank	96
Software is functioning abnormally	96
The computer is on but not responding	97
The computer is unusually warm	97
An external device is not working	97
The wireless network connection is not working	97
The optical disc tray does not open for removal of a CD or DVD	98
The computer does not detect the optical drive	99
A disc does not play	99
A movie is not visible on an external display	99
The process of burning a disc does not begin, or it stops before completion	100
Contacting customer support	100
Labels	101
Cleaning your computer	102
Cleaning products	102
Cleaning procedures	103
Cleaning the display	103
Cleaning the sides and cover	103
Cleaning the TouchPad and keyboard	103
Specifications	104
Input power	104
Operating environment	105
Electrostatic discharge	106