PC Maintenance: Preparing for A+ Certification

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Presentation transcript:

PC Maintenance: Preparing for A+ Certification Chapter 27: The Boot Process

Chapter 27 Objectives Understand bootable disks Identify key boot files in each OS version List the boot sequence for each OS Use alternative boot modes Create and use a boot floppy Use the Recovery Console Create and use an ERD Troubleshoot startup and shutdown problems

What Constitutes a Bootable Disk? A disk that can bring the PC to a functional level, with the OS ready to accept user commands

Startup Configuration Files for DOS CONFIG.SYS Used primarily under MS-DOS Plain text file Lists environment variables and device drivers Runs only at startup AUTOEXEC.BAT Lists applications to run at startup Simple batch file, can be rerun at any time

Sample CONFIG.SYS

Sample AUTOEXEC.BAT

Startup Configuration Files for Windows 3.x SYSTEM.INI Loads device drivers Defines environment variables WIN.INI Loads applications Sets display settings and I/O device settings Defines application settings

Sample SYSTEM.INI

Sample WIN.INI

The Registry 32-bit versions of Windows system settings files In Windows 9x: SYSTEM.DAT and USER.DAT In Windows NT/2000/XP: SAM, SECURITY, SYSTEM, SOFTWARE, DEFAULT Accessed through the Registry Editor as a single database

MS-DOS Boot Sequence BIOS performs POST BIOS searches for master boot record (MBR), which defines the active partition MBR takes control and locates IO.SYS IO.SYS takes control, identifies hardware IO.SYS runs CONFIG.SYS MSDOS.SYS takes control, loads OS kernel into RAM MSDOS.SYS runs AUTOEXEC.BAT Command.com displays a command prompt

Windows 9x Boot Sequence BIOS performs POST BIOS searches for MBR MBR takes control and locates IO.SYS IO.SYS takes control, runs MSDOS.SYS instructions IO.SYS loads LOGO.SYS (graphic file) and displays it as Windows “splash screen” IO.SYS looks for SYSTEM.DAT and USER.DAT and checks them

Windows 9x Boot Sequence IO.SYS loads SYSTEM.DAT IO.SYS executes CONFIG.SYS and AUTOEXECB.BAT if present IO.SYS loads HIMEM.SYS IO.SYS loads WIN.COM Win.COM loads 386.VXD (virtual memory manager) VMM386.VXD loads 32-bit device drivers

Windows 9x Boot Sequence WIN.COM processes SYSTEM.INI if present WIN.COM loads KRNL32.DLL, GDI.EXE, and USER.EXE WIN.COM executes WIN.INI if present WIN.COM runs any programs from Startup folder on Start menu

Alternative Boot Modes for Windows 9x Press F8 as PC is starting up to see Startup Menu

Alternative Boot Modes for Windows 9x

Safe Mode Minimal set of drivers Standard VGA driver No support for CD, sound, modems

Step by Step Confirmation Accept or reject each line of the startup

Windows NT, 2000, and XP Boot Sequence BIOS performs POST BIOS searches for MBR MBR takes control and locates NTLDR NTLDR switches CPU into 32-bit protected mode NTLDR reads BOOT.INI. If multiple OSes, it displays a menu for user choice, and passes control to the chosen OS NTLDR runs NTDETECT.COM, which detects the hardware for Registry

Windows NT, 2000, and XP Boot Sequence NTLDR reads NTOSKRNL (OS kernel) into memory NTLDR locates drivers for Registry-reported hardware NTLDR hands over control to NTOSKRNL.EXE NTOSKRNL.EXE loads the device drivers and the GUI

Alternative Boot Modes for NT 4 VGA mode

Alternative Boot Modes for Windows 2000 and XP

Troubleshooting 9x Startup No operating system found No bootable disk is available PC does not see hard drive Hard drive not formatting No OS installed Loose connection to hard disk Physical malfunction Virus infection IO.SYS or MSDOS.SYS missing or corrupted

Troubleshooting 9x Startup Error in CONFIG.SYS Line xx Driver called for in CONFIG.SYS missing or corrupted Bad or Missing COMMAND.COM Stuck at Windows splash screen Press Esc to see what is going on behind it Disable virtual memory Rebuild paging file

Troubleshooting 9x Startup Missing, Corrupt, or Unloaded HIMEM.SYS Windows protection error Virtual device driver problem Start in Safe Mode and check for a real-mode driver on CONFIG.SYS Remove and reinstall the device Device referenced in SYSTEM.INI or WIN.INI not found

Troubleshooting 9x Startup General protection fault (GPF) Two programs try to use the same memory space Make a note of the file causing the error, and restart If repeats, try reinstalling the associated program or using EXTRACT to re-copy file from Windows disc

Troubleshooting 2000/XP Startup Try Safe Mode Try restoring last known good configuration If Windows XP, use System Restore Repair Windows installation by booting from Setup CD and choosing Repair

Controlling What Loads at Startup Disable items in WIN.INI, SYSTEM.INI, AUTOEXEC.BAT, and CONFIG.SYS through the System Configuration Editor (SYSEDIT)

Controlling What Loads at Startup Delete items from Startup folder on Start menu

Controlling What Loads at Startup Use System Configuration Utility (MSCONFIG) to disable startup items

Creating a 9x Startup Floppy Open Control Panel Add/Remove Programs, Startup Disk tab Click Create Disk and follow the prompts

How a Boot Floppy Works Booting from floppy creates RAM disk Compressed files are decompressed onto RAM disk Therefore… some utilities are directly on the floppy, and others are on the RAM disk

Files on a Boot Floppy DRVSPACE.BIN: Support for hard disks compressed with DriveSpace EBD.CAB: The compressed file containing extra utilities to be placed on RAM disk AUTOEXEC.BAT and CONFIG.SYS FINDRAMD.EXE: Locates the RAM disk EXTRACT.EXE: Extracts compressed files to RAM disk FDISK: Partitions disks README.TXT: Information CD-ROM drivers

Files on the RAM Disk

What is an ERD? Emergency Repair Disk For Windows 2000/XP only Not bootable Stores settings that can help repair Windows, along with Windows Setup’s Repair mode Specific to that PC

Creating an ERD Start the Backup application Click the Emergency Repair Disk button Follow the prompts

What Is the Recovery Console? Command-line interface Limited set of commands Accessible even when Windows will not start normally Can repair the MBR, disable services, etc.

Booting to the Recovery Console Boot from the Windows CD Choose R for Repair Choose C for Recovery Console Type 1 to choose the Windows installation Enter administrator password when prompted

Recovery Console Commands Some are same as with Win9x startup disk: DIR EXIT EXPAND FORMAT MD RD REN ATTRIB CD MD COPY DEL CHKDSK

Recovery Console Commands Some are different from normal command prompt commands: BATCH DISABLE DISKPART ENABLE FIXBOOT FIXMBR LISTSYS

Troubleshooting Shutdown Problems Does not shut off with Shut Down command Is ACPI enabled in BIOS Setup? Is it an ATX motherboard? Is ACPI enabled in Windows? Are case wires connected to motherboard? Is a BIOS update available for motherboard?

Troubleshooting Shutdown Problems Application Not Responding Click End Task if dialog box appears Press Ctrl+Alt+Delete and shut down application No Shutdown with Power Button Hold power button down for 5 seconds

Troubleshooting Shutdown Problems Windows 98 locks up when shutting down Download patch for Windows 98 Disable Fast Shutdown (in MSCONFIG)