Lenovo 4223, 4228, 4229 manual Appendix A. Notices 109

Installing or replacing a hard disk drive . . .	83
Installing or replacing a hard disk drive
enablement module	87
Replacing the front audio and USB
assembly	88
Replacing the internal speaker	89
Installing or replacing the microprocessor . .	90
Replacing the system board	99
Replacing the power supply assembly . . .	102
Completing the parts replacement	104

Chapter 11. Additional service
information	105
Security features	105
Hardware-controlled passwords	105
Operating system password	105
Vital product data	105
BIOS levels	105

Updating (flashing) the BIOS	105
Updating (flashing) the BIOS from a disc. . . 105
Updating (flashing) the BIOS from your
operating system	106
Recovering from a POST/BIOS update failure . .	106
Power management	107
Automatic configuration and power interface
(ACPI) BIOS	107
Automatic Power-On features	107
System memory speed	107

Appendix A. Notices	109
Television output notice	110
European conformance CE mark	110
Trademarks	110
Index	111

ivThinkStation Hardware Maintenance Manual