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IBM 6648 User Guide - Page 102

Memory problems, Action

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Memory problems Memory problems The amount of memory displayed is less than the amount of memory installed. Action The amount of available memory shown might be somewhat less than expected because of basic input/output system (BIOS) shadowing in random access memory (RAM), video takes 1 MB, and ACPI and USB also can take up to 1 MB. Verify that: 1. You have installed the correct type of DIMMs for your computer. See "Installing memory" on page 50 for instructions on adding DIMMs. 2. The DIMMs are properly installed and securely connected. 3. If you added or removed memory, you saved the new configuration before exiting from the Configuration/Setup Utility program. If the problem persists, run the memory test from the diagnostic program supplied with your computer. (See "IBM Enhanced Diagnostics program" on page 92 for further information.) The system might have detected a bad DIMM and automatically reallocated memory to enable your computer to continue to operate. If you cannot correct the problem, have the computer serviced. 88 User Guide

Section	Page
User Guide A20 Type 6269 A40 Types 6568, 6578, 6648 A40p Types 6569, 6579, 6649	1
Safety information	5
Lithium battery notice	5
Laser compliance statement	5
About this book	9
Related information	9
Contents	11
Chapter 1. IBM NetVista computer overview	15
Identifying your computer	15
Small form factor desktop models	16
Desktop models	17
Features	18
Chapter 2. Setting up your computer	21
Selecting a location for your computer	21
Connecting computer cables	21
Turn on power	25
Finish the installation	26
Arranging your workspace	27
Comfort	27
Glare and lighting	28
Air circulation	28
Electrical outlets and cable lengths	28
Chapter 3. Operating and caring for your computer	29
Starting your computer	29
Using video features	29
Video device drivers	29
Changing monitor settings	30
Using audio features	30
Using diskettes	31
Handling and storing diskettes	32
Inserting and removing diskettes	32
Using a CD-ROM drive	32
Handling a CD	33
Loading a CD	33
Using the IBM ScrollPoint II mouse	34
Updating system programs	34
Using network management tools	35
Wake on LAN	35
Remote Program Load or Dynamic Host ConfigurationProtocol	36
Remote Administration	36
LANClient Control Manager (LCCM)	36
System Migration Assistant (SMA)	36
Desktop Management Interface	37
Using security features	37
Anti-intrusion features	37
Component protection	37
Asset ID capability	38
IBM security solutions	38
Data protection	38
SMART hard disk drive	39
SMART Reaction	39
Virus protection	39
Enhanced Security	39
Locking the keyboard	39
Shutting down	40
Taking care of your computer	40
Basics	40
Cleaning your computer	40
Computer and keyboard	40
Monitor screen	41
Mouse	41
Moving your computer	42
Chapter 4. Using the Configuration/Setup Utilityprogram	43
Starting and using the Configuration/Setup Utility program	43
Viewing and changing settings	44
Exiting from the Configuration/Setup Utility program	45
Using System Security	45
Using Enhanced Security	45
Using Security Profiles by Device	47
Setting Remote Administration	48
Using passwords	48
Using a power-on password	48
Setting, changing, and deleting a power-on password	49
Using an administrator password	50
Setting, deleting, or changing an administrator password	50
Erasing a lost or forgotten password (clearing CMOS)	51
Using Adapter ROM security	51
Using the IBM Embedded Security Chip	51
Enabling the Pentium III processor serial number feature	52
Other settings in the Configuration/Setup Utility program	52
Changing keyboard speed	52
Changing the primary startup sequence	53
Enabling the Error Startup Sequence	53
Power-management features	53
ACPI BIOS IRQ	54
ACPI Standby Mode	54
Setting power-management features	54
Chapter 5. Installing options	57
Handling static-sensitive devices	57
Available options	58
Tools required	58
Removing the cover	59
Locating components—small form factor desktop model	60
Locating components—desktop model	61
Installing options on the system board and riser card (somemodels)	61
Accessing the system board	61
Identifying parts on the system board	62
Components of the A40 and A40p system board	62
Components of the riser card for small form factor desktop models	63
Components of the A20 system board	64
Installing memory	64
Installing adapters	66
Adapter slots	66
Installing adapters — small form factor desktop model	67
Installing adapters — desktop model	70
Installing internal drives	71
Drive specifications — small form factor desktop model	72
Drive specifications — desktop model	73
Power and signal cables for internal drives	74
Installing internal drives in the desktop model computer	76
Installing a security U-bolt	79
Completing the installation	79
Replacing the cover and connecting the cables	79
Updating the computer configuration	80
Starting the Configuration/Setup Utility program	81
Configuring startup devices	82
Chapter 6. Troubleshooting	83
Troubleshooting procedure	84
Power-on self-test (POST)	85
Diagnostic error codes and messages	85
POST error codes	86
POST beep codes	89
Ethernet error messages	90
RPL-related error messages	90
DHCP-related error messages	91
Device troubleshooting charts	92
General problems	93
Intermittent problems	94
Audio problems	95
CD-ROM drive problems	96
Diskette drive problems	98
Monitor problems	98
Keyboard, mouse, or pointing device problems	101
Memory problems	102
Option problems	103
Parallel-port problems	104
Serial-port problems	104
Printer problems	105
Application problems	105
Universal Serial Bus (USB) problems	106
Software-generated error messages	106
IBM Enhanced Diagnostics program	106
Other diagnostic programs on the Software Selections CD	108
Recovering from a POST/BIOS update failure	108
Installing files from option diskettes	109
Replacing the battery	109
Chapter 7. Getting help, service, and information	113
Service support	114
Before you call for service	115
Getting customer support and service	115
Using the World Wide Web	115
Getting information by fax	116
Getting help by telephone	116
Getting help around the world	118
Purchasing additional services	119
Enhanced PC support line	119
900-number operating system and hardware support line	119
Network and server support line	119
Ordering support line services	120
Warranty and repair services	120
Ordering publications	121
Appendix A. Using the Software Selections CD	123
Features of the Software Selections CD	123
Starting the Software Selections CD	124
Using the Software Selections program	124
Appendix B. Specifications	125
Specifications — small form factor desktop model	125
Specifications — desktop model (A40 and A40p)	126
Specifications — desktop model (A20)	127
Appendix C. Placing the computer on its side	131
Placing the small form factor desktop computer on its side	131
Placing the desktop computer on its side	132
Appendix D. Computer records	133
Appendix E. Notices and trademarks	135
Notices	135
Processing date data	136
Trademarks	136
Electronic emissions notices	137
Class B notices	137
Federal Communications Commission (FCC) statement	137
Class A notices	139
Federal Communications Commission (FCC) statement	139
Federal Communications Commission (FCC) and telephonecompany requirements	140
Power cord notice	143