Manuals / Lenovo / Computer Equipment / Laptop

Lenovo 42421A0, 42825BU Display and multimedia devices, Computer screen problems, Click Keyboard

Models: 4242X04 NVS-4200M 42421A0 42825BU

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If the keyboard problem is resolved, carefully reconnect the external numeric keypad, external keyboard, making sure that you have seated the connectors properly.

If the problem remains, make sure that the correct device driver is installed.

For Windows 7:

1.Click Start ➙ Control Panel. Change the view of the Control Panel from Category to Large icons or Small icons.

2.Click Keyboard.

3.Select the Hardware tab. In the Device Properties, make sure that the Device Status is This device is working properly.

For Windows Vista:

1.Click Start ➙ Control Panel.

2.Click Hardware and Sound, and then click Keyboard.

3.Select the Hardware tab. In the Device Properties, make sure that the Device Status is This device is working properly.

For Windows XP:

1.Click Start ➙ Control Panel.

2.Click Printers and Other Hardware, and then click Keyboard.

3.Select the Hardware tab. In the In the Device Properties, make sure that the Device Status is This device is working properly.

If keys on the keyboard still do not work, have the computer serviced.

•Problem: A number appears when you type a letter.

Solution: The numeric lock function is on. To disable it, press Shift+ScrLk or Fn+NmLk.

•Problem: All or some keys on the external numeric keypad do not work.

Solution: Make sure that the external numeric keypad is correctly connected to the computer.

Display and multimedia devices

This section includes the most common display and multimedia devices problems which are computer screen, external monitor, audio, and optical drive. Check these topics to learn more information.

Computer screen problems

•Problem: The screen is blank.

Solution: Do the following:

–Press Fn+F7 to bring up the image.

Note: If you use the Fn+F7 key combination to apply a presentation scheme, press Fn+F7 at least three times in three seconds, and the image is displayed on the computer screen.

–If you are using the ac power adapter, or using the battery and the battery status indicator is on (is green), press Fn+Home to make the screen brighter.

–If the sleep (standby) status indicator is on (is green), press Fn to resume from the sleep (standby) mode.

–If the problem persists, do the Solution in the problem below.

Note: If your computer is a Windows 7 model, it does not support the presentation scheme.

• Problem: The screen is unreadable or distorted.

Chapter 10. Troubleshooting computer problems 241

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Lenovo 42421A0 manual Display and multimedia devices, Computer screen problems, Click Keyboard, Click Start Control Panel
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4242X04, NVS-4200M, 42421A0, 42825BU specifications

Lenovo offers a diverse range of products tailored to meet the needs of professionals and consumers alike. Among them, models such as the Lenovo 42825BU, 42421A0, and 4242X04 stand out with impressive specifications that cater to various use cases.

The Lenovo 42825BU is an excellent choice for those seeking a dependable laptop for general productivity tasks. Powered by the latest generation Intel Core processor, it ensures smooth performance whether you're working on spreadsheets, attending virtual meetings, or browsing the web. One of its standout features is the high-resolution display that delivers vivid colors and sharp images, making it perfect for graphic design work or watching videos. Furthermore, the device includes ample RAM, allowing for multitasking without lag and enhancing overall efficiency.

Next in line, the Lenovo 42421A0 offers enhanced processing power and graphics performance thanks to the inclusion of the NVIDIA NVS-4200M graphics card. This feature is particularly beneficial for professionals who require a workstation that can handle demanding graphical applications such as video editing and 3D modeling. The NVS-4200M provides excellent visual output, ensuring that users can work with advanced graphics tools without compromising performance.

The 4242X04 model takes portability to another level without sacrificing power, making it ideal for on-the-go professionals. With a lightweight design and long battery life, it allows users to work from anywhere without the constant need for a power source. Coupled with fast charging technology, users can quickly recharge their devices during breaks, ensuring minimal downtime.

All these Lenovo models are built with reliability and durability in mind, often featuring robust chassis that can endure daily wear and tear. Additionally, they incorporate various security features including biometric login options, enabling safe and secure access to sensitive data.

In summary, the Lenovo 42825BU, 42421A0, and 4242X04 laptops are designed to meet the demands of a diverse user base. With powerful processing capabilities, impressive graphics performance, and features designed for portability and durability, these models are well-suited for both professional and personal use.