C. Inside the System CasingC. Inside the System Casing

Encloses most of the key electronic Encloses most of the key electronic components of the personal components of the personal computer that allows it to function, computer that allows it to function, including the motherboard, power including the motherboard, power supply, and expansion cards. supply, and expansion cards.

Major components of system caseMajor components of system case Power supplyPower supply CoverCover ChassisChassis Front panelFront panel SwitchesSwitches Drive baysDrive bays

CASE COMPONENTSCASE COMPONENTS

ChassisChassis- Skeletal Skeletal

framework that framework that provides the provides the structure and structure and rigidity, and rigidity, and strength of the strength of the casecase

CoverCover- plays an important - plays an important

role in cooling, role in cooling, protection, and protection, and structure of the PCstructure of the PC

Power supplyPower supply- To convert AC To convert AC

power to DC power power to DC power for use by the PC’s for use by the PC’s internal internal componentscomponents

Front panelFront panel- Provides Provides

information on the information on the PC’s statusPC’s status

Front Panel LEDsFront Panel LEDs Power LED Power LED – – Typically green in color and Typically green in color and

illuminated when the PC’s power is onilluminated when the PC’s power is on Hard drive LEDHard drive LED – – when the disk drive is reading, or when the disk drive is reading, or

writing a datawriting a data Turbo LED Turbo LED – – yellow LED indicates that the PC is yellow LED indicates that the PC is

inturbointurbo

SwitchesSwitches- Power switches Power switches

and the reset and the reset switch on the front switch on the front panelpanel

Front Panel SwitchesFront Panel Switches Power button – a proxy switch; pressing Power button – a proxy switch; pressing

the front panel switch activates the power the front panel switch activates the power supply switchsupply switch

Reset button – performs a hardware reset Reset button – performs a hardware reset when pressedwhen pressed

Turbo button Turbo button – – present only in the old computers 286 and present only in the old computers 286 and

386386- Not connected to anything- Not connected to anything

Drive baysDrive bays- Used for the floppy drives, CD-ROMS and DVDs Used for the floppy drives, CD-ROMS and DVDs

and removable hard drivesand removable hard drives

Two types of drive baysTwo types of drive bays External drive baysExternal drive bays

- are typically used for drives that have removable - are typically used for drives that have removable media, such as floppy disks, CD-ROMs, DVDs media, such as floppy disks, CD-ROMs, DVDs

Internal drive baysInternal drive bays- completely inside the system case and are not - completely inside the system case and are not accessible to the outside chassis, designed for accessible to the outside chassis, designed for devices with no external exposure, primarily the devices with no external exposure, primarily the hard disks. hard disks.

System Cases StylesSystem Cases Styles

• DesktopDesktop• Tower CasesTower Cases

-- Full towerFull tower-- MidtowerMidtower-- MinitowerMinitower

System Case FeaturesSystem Case Features I/O templatesI/O templates

-- can be snapped into a case to can be snapped into a case to provide the I/O port pattern desired.provide the I/O port pattern desired.

I/O portsI/O ports-- ports used for the I/O devices ports used for the I/O devices (mouse, keyboard, printer)(mouse, keyboard, printer)

Power SupplyPower Supply-- to convert AC power to DC to convert AC power to DC power in the PC.power in the PC.

Power Cord Plug Power Cord Plug Auxiliary FanAuxiliary Fan

-- main cooling fan in the PC.main cooling fan in the PC. Fan GrillFan Grill Expansion slotsExpansion slots Air ventingAir venting Chassis rearChassis rear Front chassisFront chassis External and Internal drive baysExternal and Internal drive bays