Windows has a built-in utility called Keyboard and Mouse Troubleshooter that can help you diagnose and fix common problems with your input devices. To access it, go to Settings > Update & Security > Troubleshoot > Additional troubleshooters > Keyboard or Mouse. Follow the instructions on the screen and let the utility scan and repair any issues. You can also check the Device Manager to see if your keyboard and mouse are detected and have the right drivers installed. To open Device Manager, press Windows + X and select it from the menu. Look for any yellow exclamation marks or red crosses next to your keyboard and mouse devices and update or uninstall the drivers if needed.
Best way I know of is old school. Plug it in. Do a visual on device and test with Note Pad. Just keep it simple. Keyboard is a basic device. Don't make a simple thing difficult. Usually Mouse & Keyboard break and you replace
Mac users can use the Keyboard Viewer and the Mouse or Trackpad preferences to test their input devices. To enable the Keyboard Viewer, go to System Preferences > Keyboard > Input Sources and check the box for Show Input menu in menu bar. Then click on the input menu icon on the menu bar and select Show Keyboard Viewer. You can use the Keyboard Viewer to see which keys are pressed and if there are any stuck or non-responsive keys. To test your mouse or trackpad, go to System Preferences > Mouse or Trackpad and adjust the settings and options according to your preferences. You can also use the Test Your Settings button to see how your mouse or trackpad responds to your gestures and clicks.
Linux users can use various commands and utilities to test their keyboard and mouse functionality. One of the simplest commands is xev, which can show you the events generated by your input devices. To use it, open a terminal and type xev. A small window will appear and you can move your mouse or press any key inside it. You will see the details of each event on the terminal, such as the button number, the key code, the key symbol, and the modifiers. Another useful command is lsusb, which can list all the USB devices connected to your system, including your keyboard and mouse. You can use it to check if your input devices are recognized and have the correct drivers loaded.
BIOS stands for Basic Input Output System and it is the firmware that controls the hardware settings and boot sequence of your computer. Sometimes, you may need to access the BIOS to change some settings or troubleshoot some issues. To do so, you need to press a specific key or combination of keys during the startup process, such as F2, F10, Del, or Esc. The exact key depends on your computer model and manufacturer, so check your manual or online documentation for more information. Once you enter the BIOS, you can use your keyboard and mouse to navigate the menus and options. If your keyboard and mouse work in the BIOS, it means that they are not physically damaged or disconnected. However, if they do not work in the BIOS, it may indicate a hardware problem or a compatibility issue.
If none of the above methods work for you or you want to test your keyboard and mouse in a different environment, you can use a bootable USB drive or CD/DVD with a live operating system. A live operating system is a portable version of an operating system that runs entirely from a removable media, without installing anything on your hard drive. You can use a live operating system to test your keyboard and mouse functionality without affecting your main operating system or data. Some examples of live operating systems are Ubuntu, Knoppix, Hiren's Boot CD, and Ultimate Boot CD. You can download them from their official websites and follow the instructions to create a bootable USB drive or CD/DVD. Then, you can boot your computer from the media and use your keyboard and mouse as normal.
Testing your keyboard and mouse functionality can be done more effectively with some additional tips and tricks. For example, try using different USB ports or connectors for your keyboard and mouse, or use a different keyboard and mouse on your computer. Additionally, cleaning your keyboard and mouse with a soft cloth, compressed air, or alcohol wipes can help remove dust, dirt, crumbs, or liquids that interfere with the input signals. Furthermore, you can use keyboard and mouse shortcuts to perform common tasks or access settings. For instance, you can use Ctrl + Alt + Delete to open the Task Manager, Windows + L to lock your screen, or Command + Space to open Spotlight on Mac.