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CHAPTER :one: (Ricardo Sobenis-Cooling systems (Generators of unwanted…

- - - - Are divided in
    - - Classifies in
        
        Fixed Devices
        
        For example a CD/DVD
        
        Removable Devices
        
        For example a pen drive
- - - - unusual burning odor
        
        Random lock ups or freezing issues
        
        If a computer has been freezing up lately, the first thing that you should do to troubleshoot it is to see if software is to blame. However, if you’ve already ruled out all software factors, the next good thing to do is to consider other hardware variables, including the possibility that the motherboard may be failing.
        
        Most of the time, a really strong burning smell is an indication that an overheated component. Sometimes, plugging in an incompatible component can lead to overheating or failure
      - The first thing that you want to do is to physically check the motherboard. This will allow you to examine if there is any bloated or damaged capacitor causing the issue.Leaking or bloated capacitors are usually products of overheating, material defect, or agin.
  - - - Reasons why a motherboard fails
        
        Overheating
        
        Too much dust in the system
        
        Accidental drop that subjects components to unnecessary shock
        
        Aging
        
        Power surges or unstable voltage
  - - - Computer Case
        
        Monitor
        
        Power Cord
        
        Keyboard
        
        Mouse
        
        The mouse is a peripheral that is known as a pointing device. It lets you point to objects on the screen, click on them, and move them.Traditionally, a mouse connects to the computer using a USB orPS/2 connection.
        
        The keyboard is one of the primary ways we communicate with the computer and enter data. There are many different types of computer keyboards such as wired, wireless, ergonomic, multimedia, and more.
        
        The power cord is the link between the power outlet and thepower supply unit in the computer casing. If the power cord is not plugged in, the computer will not power on.
        
        The monitor works with a video card, located inside the computer case, to display images and text on the screen.Most monitors have control buttons that allow you to change your monitor's display settings, and some monitors also have built-in speakers.
        
        The computer case is the metal and plastic box that contains the main components of the computer. It houses the motherboard, central processing unit (CPU), the power supply, and more.
- - - - If the appropriate driver is not installed, the device may not function properly, if at all. For Microsoft Windows users, a driver conflict or an error can be seen in the Device Manager. If problems or conflicts are encountered with a driver, the computer manufacturer or hardware manufacturer will release a driver update to fix the problems.
- - - - Segment displays some displays can show only digits or alphanumeric characters. They are called segment displays, because they are composed of several segments that switch on and off to give appearance of desired glyph. The segments are usually single LEDs or liquid crystals. They are mostly used in digital watches and pocket calculators.
      - Full-area 2-dimensional displays
        2-dimensional displays that cover a full area (usually a rectangle) are also called video displays, since it is the main modality of presenting video.
      - Liquid-crystal display
        A liquid-crystal display (LCD) is a flat-panel display or other electronically modulated optical device that uses the light-modulating properties of liquid crystals. Liquid crystals do not emit light directly, instead using a backlight or reflector to produce images in color or monochrome.
    - - Display devices play a major and changing role in homes, schools, and businesses across the U.S. From their initial widespread appearance as yesterday’s big and bulky high-voltage cathode ray tube (CRT) models to today’s paper-light cutting edge touch displays, these machines have seen a rapid advancement in both their capabilities and their place in modern life.
- - - - Biometric device
        
        DEFINITION
        
        A biometric device is a security identification and authentication device. Such devices use automated methods of verifying or recognising the identity of a living person based on a physiological or behavioral characteristic. These characteristics include fingerprints, facial images, iris and voice recognition.
      - DEFINITION
        
        Multimedia is content that uses a combination of different content forms such as text, audio, images, animations, video and interactive content. Multimedia contrasts with media that use only rudimentary computer displays such as text-only or traditional forms of printed or hand-produced material.
        Multimedia can be recorded and played, displayed, interacted with or accessed by information content processing devices, such as computerized and electronic devices, but can also be part of a live performance.
    - - An input device is a piece of computer hardware equipment used to provide data and control signals to an information processing system such as a computer or information appliance. Examples of input devices include keyboards, mouse, scanners, digital cameras, joysticks, and microphones.
- - - - It also regulates the voltage to eliminate spikes and surges common in most electrical systems. Not all power supplies, however, do an adequate voltage-regulation job, so a computer is always susceptible to large voltage fluctuations. Power supplies are rated in terms of the number of watts they generate. The more powerful the computer, the more watts it can provide to components.
- - - - Unexpected rise of temperature in a portion of electrical circuit, that can cause harm to the circuit, and accidents. Computers are designed with heat dispersion and ventilation in mind so they don’t overheat.
    - - Check your computer’s documentation—or its CPU or graphics card specifications—to ensure you know the appropriate temperature ranges for your hardware.
    - - Clean Out Your Computer’s Case
      - Ensure Proper Ventilation
      - Check if the Fans Are Running
      - Tune Up Heat Sinks
      - Double-Check Liquid Cooling
- - - - EXTERNAL HARDWARE
      - INTERNAL HARDWARE
- - - - The key to replacing your CMOS battery is making sure you purchase the correct battery. You will need to open up your PC to get to the battery. Check your PC’s manual for the best way to do this. Generally, this is a pretty simple task. Important: Make sure to unplug the computer before opening it up.
      - Next, remove the CMOS battery from the motherboard. It will look like the picture at the beginning of this post and will be seated on your motherboard. After you have the battery, you can either write down all the information listed on the battery, or you can simply take the battery with you when looking to buy a new one. While at the store, try to find the closest possible match. Try to get a battery with the same voltage.