Chapter 6. Loading the System DiagnosticsIf no keys are pressed after the system unit power is turned on, the system unitsearches a list of devices (the default boot list) for a bootable image. If a bootableimage is found, then the system unit loads and starts the operating system. This iscalled a normal boot.The system unit can also be booted from a custom boot list, which can be changedthrough the System Management Services.If certain keys are pressed during system startup, the system unit searches thedefault or custom boot list for a bootable image to start in service mode instead ofnormal mode. After a successful service mode boot, the diagnostic programs arestarted automatically.The following pages describe the default and custom boot lists, and how to boot fromthese in either normal or service mode.Default Boot ListThe default boot list is composed of the first device found of each of the followingtypes:1. Diskette drive2. CD-ROM drive3. Disk Drive4. Network deviceIf this default boot list is used during system startup, the system unit attempts to bootfrom the diskette drive, then the first CD-ROM drive encountered, then the first diskdrive encountered, and finally the first network connection encountered.Custom Boot ListThe contents of the custom boot list can be defined by using the graphical SystemManagement Services or the text-based System Management Services When thecustom boot list is utilized during system startup, system unit attempts to boot in turnfrom each specific device in the custom boot list.Note: Only the specific devices contained in the custom boot list are checked for abootable image. Other devices of the same type are not searched for abootable image unless they are also specified in the custom boot list. ReferChapter 6. Loading the System Diagnostics 6-1
