There are several potential reasons why your mouse and keyboard may not be working. First, it is possible that the mouse and/or keyboard are defective or have lost their connection to the computer. If this is the case, you will need to test both of them on a different computer or by connecting them to a different USB port to see if they are working properly.
Second, it is possible that the mouse and/or keyboard are not compatible with your computer. In this case, you will need to check that the mouse and keyboard are compatible with the operating system installed on your machine. If you are running an older operating system, for example, then the mouse might not work properly due to compatibility issues.
Third, if the mouse and/or keyboard are connected via wireless technology, you may need to re-sync them up with the computer. This process may also require you to upgrade the firmware of your device.
Finally, if you are using a laptop, it is possible that the mouse or keyboard has ceased to function because the trackpad or built-in keyboard on the laptop may be malfunctioning. If this is the case, you may need to replace the laptop’s components or have them repaired.
Overall, there are several potential reasons why your mouse and keyboard may not be working correctly. If you have checked all of the above possibilities and your mouse and keyboard still do not work, it is best to contact a professional who can provide further assistance and diagnosis.