Screen Issues
Your LCD computer monitor relies on a backlight to illuminate the colors and images generated on its screen. Light-emitting diodes, or LEDs, and cold-cathode fluorescent lamps, or CCFLs, are the two main types of backlight technology used for LCDs. These backlights have a life expectancy of 20,000 to 50,000 viewing hours, depending on which technology your computer uses. A key sign of backlight failure is a screen that turns on -- but just for a few seconds -- before flashing to black; a dim screen or a flickering screen are failing backlight symptoms as well. Having your screen's backlight replaced should alleviate the flashing issue.
Sound and Video Card
Audio that cuts in and out on a computer can be a sign of sound card failure; likewise, flickering or flashing video on a screen is a sign of video card failure. Laptops use these cards to help generate the pictures and sounds you see and hear on screen; these cards require periodic software updates, which come from your manufacturer's website. Check your computer's settings menu to make sure these cards are installed properly. Next, visit your manufacturer's support website to determine whether the company has released any software updates specifically for your computer. Download and install any updates, restarting your computer to complete the process. The sound and video cards aren't linked in any way; just because one requires an update does not mean the other does as well.
Cable Connections
Unless you're using a laptop on the go, your computer requires multiple cable connections to operate correctly. Desktop computers use power cords, as do laptops while they're charging. Desktops also use cables to connect the CPU to the monitor, and both types of computers use cables to connect to exterior speakers. A short in any of these cables can cause issues, as can improper connections or damaged plugs. A frayed, crimped or otherwise damaged power cord, or a cord that isn't plugged in correctly, can cause interruptions to both your video and sound on the screen.
Technical Failure
The failure of several key components within your computer can lead to interruptions with your picture and sound. One of these components is your computer's power supply unit, or PSU, which delivers a constant stream of electricity to your computer. A faulty PSU cannot protect against dips and surges, leaving your computer vulnerable to power outages and fried circuits. Your computer's BIOS is built into the motherboard; BIOS software is responsible for all your computer's basic functions -- such as booting up -- and requires periodic updates, which can be obtained from your computer's manufacturer. Additionally, your computer's CMOS battery is responsible for storing its BIOS settings -- meaning that a dying CMOS battery can corrupt the integrity of your BIOS settings as well.
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