Computer Systems Fault Finding

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Christopher Munro

Assignment 2
T ask 2
Explain the role of the following in relation to the system under investigation:(a) BIOS routines (b) the POST procedure(c) the role of the CMOS RAM.3.1 Summarize the operating system files and the order in which they are loaded for a selected operating

system

2 2 /12/2012

CONTENTS
Over View Of The Problem ...................................................................... 3 Diagnosis & Repair .................................................................................... 3 BIOS Routines .............................................................................................. 5 What The Basic-Input-Output-System (BIOS) Does .............................................. 5 CMOS Setup...................................................................................................................... 5 Loading Device Drivers & Interrupt Handlers ............................................................... 5 Start Power Management & Loading Registers & ESCD ............................................ 5 Power-On-Self-Test (POST) ............................................................................................... 6 Display System Settings .................................................................................................... 6 Determine what devices are bootable ........................................................................ 6 Initiating The Bootstrap Sequence ................................................................................. 6

BIOS Routine Flow Chart .......................................................................................... 7

POST Routines ............................................................................................. 8 Role Of CMOS RAM ................................................................................ 10 Operating System Files ........................................................................... 11 Windows Boot File Load Sequence ..................................................................... 12 Windows Boot Loader Phase ................................................................................ 13 Windows Kernel (Ntoskrnl.exe) ............................................................................. 13 Windows Security .................................................................................................... 13 Possible System Start-Up Issues.............................................................................. 14 Bibliography ............................................................................................................. 15

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Over View Of The Problem
I have now been using my bespoke computer for several months however it has recently started acting peculiar when starting up. I have checked the Operating System to ensure it’s not corrupt; I have checked the integrity of the OS files and finally run a repair from the OS installation CD. This seemed to fix the problems but only for a short while as it’s now playing up again. The boot order seems to have spontaneously changed. I have checked the System Time and date which was incorrect so I opened the case and checked the CMOS battery was seated correctly and once happy changed the date and time in the BIOS settings. This seemed to be ok for a few days and then failed again.

Diagnosis & Repair
The First thing I am going to check is that the BIOS is not corrupt with a virus as random errors and hardware malfunctions also can indicate the BIOS file is corrupted. Normally the most obvious sign of a corrupted BIOS is the absence of the POST screen. As the POST screen is appearing as it should I am inclined to think there is no Virus within the BIOS, however to be 100% sure I am going to update the BIOS with the correct version (not my original one). After completing the BIOS update the computer POSTs as it should, so I now know there is no...
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