电脑开机 keyboard and display not working: Common causes and solutions

Computers can sometimes face issues where the keyboard and display do not light up when the computer is powered on. These issues can be frustrating, especially if you are trying to use the computer for important tasks. Luckily, most of these problems can be resolved with a bit of troubleshooting. In this article, we will explore common reasons why the keyboard and display might not work when you turn on your computer and how to fix them.

1. Hardware Component Issues

One of the most common reasons why the keyboard and display do not light up is a problem with the hardware components inside your computer. This can include the graphics card (显卡), power supply unit (电源), or motherboard. If any of these components are faulty, they can prevent the computer from functioning properly.

1.1 What is the Graphics Card (显卡)

The graphics card (显卡) is responsible for rendering images on your computer screen. It works with the central processing unit (CPU) to create the visuals you see on your screen. If your graphics card is damaged or not working, the computer will not display anything on the screen, and the keyboard may not be lit up either.

1.2 Common Graphics Card Problems

• Firmware Issues: The graphics card might have outdated or corrupted firmware. This can happen if the card is not updated with the latest drivers or updates from the manufacturer.
• Power Supply Failure (电源故障): The power supply unit (PSU) delivers power to the graphics card and other components. If the PSU is faulty, it cannot provide the necessary power, leading to blank screen or no keyboard lighting.
• Board-Level Issues: Some hardware flaws at the circuit board level can cause the display and keyboard to not light up. These issues can be more permanent and often require professional repair.

2. Software Problems

Software issues can also cause the keyboard and display to not work when you turn on your computer. These problems can occur if there is a software malfunction, such as a system crash or incorrect driver installation.

2.1 Common Software Issues

• System Crashes: A spontaneous system crash can leave you without a working keyboard or display until you restart your computer.
• Incorrect or Missing Drivers: Drivers are essential software that allows your hardware components to function properly. If a driver is incorrect or missing, your computer will not recognize your graphics card or other components, leading to no keyboard or display lighting up.
• Compatibility Issues: Outdated or incompatible software can also cause display and keyboard issues. For example, some older versions of Windows may not fully support certain graphics cards or keyboard technologies.

2.2 How to Fix the Problem

If you suspect a software issue, the best solution is to check for and install the latest driver for your graphics card. Drivers can often be downloaded for free from the manufacturer's website or directly from the operating system's website.

3. Common Faults and Solutions

There are several common computer faults, and some of them can cause the keyboard and display to not light up.

3.1 Key Issues with the Keyboard

• No Keyboard Lights: If the keyboard lights do not come on, it can indicate a power issue or a component failure.
• No Keypad Lights: A keypad may not light up due to a power or circuit issue elsewhere in the computer.

3.2 Key Issues with the Display

• No Display: If there is no display, it may be due to a faulty graphics card, improper power supply, or a broken monitor cable.
• Flickering or Glaring Screen: These issues can sometimes be due to a faulty graphics card or a power supply problem. Cleaning the screen can sometimes fix the problem, but it is better to replace the graphics card if possible.

4. How to Check for Kernel Issues

To check if your keyboard lights are not on, follow these steps:

1. Check for Indicators

2. Look for a power indicator on the keyboard and a power indicator on the screen. These are usually small lights that illuminate when your keyboard or screen is powered on.

3. Check the PSU

4. Ensure that your power supply unit is working and providing power to the computer. A faulty PSU will not provide proper power, leading to no lights.

5. Check the Components

6. Inspect all your computer's components. Look for any signs of wear and tear, such as damaged resistors, capacitors, or other electronic components.

7. Illuminator Check for More Details

8. Magically cleaning under or around the keyboard and display can reveal issues with brightness or wiring.

5. Resetting the Computer

Resetting your computer is a good way to check if it is a temporary glitch. To reset your computer, follow these steps:

1. Turn off your computer.
2. Press the power button repeatedly until the machine beeps but does not turn off. Then release the power button.
3. Once the computer begins to boot, stop it when the booting process finishes. Then restart your computer.

A reset can clear some errors and may resolve the issue without having to replace any components.

6. How to Factory Reset Your Computer

A factory reset will clear all settings on your computer. You can do a factory reset if you want to start fresh, but be prepared to lose all data and settings.

1. Unplug your computer from the power source.
2. Hold down the power button and the reset button for at least 15 seconds. If the machine does not turn off, do not press the reset button, as it could damage your computer.

7. Checking for Keyboards and Display Issues

Here are some steps you can take to troubleshoot your keyboard and display.

7.1 Check the Keyboard's Power

Your keyboard might not light up because of a faulty power cord, electrical fault in the keyboard, or a missing or faulty zero-jumper (the small capacitors inside the keyboard that help with power distribution).

7.2 Connecting the Monitoring Cable

If your monitor is not lighting up, ensure that the cables are properly connected to both components.

7.3 Monitoring the Computer's Health

Use tools like disk monitoring, memory monitoring, and processor monitoring to look for signs of problems.

8. Conclusion

The keyboard and display failing to light up when you turn on your computer is a common issue that can be resolved by checking for hardware or software problems. Running through the steps mentioned above is usually the best way to resolve this type of problem. If you have tried these fixes without success or are unable to address the issue yourself, it's best to visit a computer repair professional for diagnosis and fixing.