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Chapter 3: Computer Assembly Step by Step 17Figure 3-9All External Cables Plugged into the BackVirtual Desktop Activity: External CablesComplete the external cable installation in the Virtual Desktop external cable layer. Refer tothe Virtual Desktop software on the CD that comes with this book.Lab 3.8.2: Complete the Computer AssemblyIn this lab you reattach the case and connect the external cables to complete the computerassembly. Refer to the lab in IT Essentials: PC Hardware and Software Labs and StudyGuide, Third Edition. You may perform this lab now or wait until the end of the chapter.Boot the Computer for the First TimeWhen the computer is booted, the basic input/output system (BIOS) performs a check ofall the internal components, as shown in Figure 3-10. This check is called a power-on selftest (POST).After completing this section, you will meet these objectives:■■Identify beep codes.Describe the BIOS setup.
18 IT Essentials: PC Hardware and Software Companion GuideFigure 3-10POST Screen ShotIdentify Beep CodesPOST checks to see that all the hardware in the computer is operating correctly. If a deviceis malfunctioning, an error or beep code alerts the technician that a problem has occurred.Typically, a single beep denotes that the computer is functioning properly. If a hardwareproblem exists, the computer may emit a series of beeps. Each BIOS manufacturer uses differentcodes to indicate hardware problems. Table 3-1 is a sample chart of beep codes. Thebeep codes for your computer may be different. Consult the motherboard documentation toview beep codes for your computer.Table 3-1Sample Beep CodesBeep Code Meaning Cause1 beep (no video) Memory refresh failure Bad memory2 beeps Memory parity error Bad memory3 beeps Base 64K memory failure Bad memory4 beeps Timer not operational Bad motherboard5 beeps Processor error Bad processor6 beeps 8042 gate A20 failure Bad CPU or motherboard7 beeps Processor exception Bad processor8 beeps Video memory error Bad video card or memory
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vAbout the Technical ReviewersDavid
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CHAPTER 1Introduction to the Person
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CHAPTER 7Fundamental Printers and S
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CHAPTER 13Advanced Laptops and Port
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GlossaryThis glossary defines many
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ase station 3AppleTalk A protocol s
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CMOS battery 5bus topology A networ
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desktop computer 7crosstalk Interfe
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dynamic routing 9Domain Name System
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floppy data cable 11FFast Ethernet
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