If your monitor and keyboard are not working, it is likely that there is a problem with the hardware. Sometimes, however, the issue can be resolved by restarting your computer or adjusting the settings.
If you are using a desktop computer, make sure that the power cord is plugged into the back of the monitor and that the monitor is turned on. If you are using a laptop, make sure that the power cord is plugged into an outlet and that the battery is charged.
Next, check to see if your keyboard and mouse are plugged into the correct ports on your computer. If they are not, unplug them and plug them back in to the correct port. If you are still having trouble, try restarting your computer.
If neither of these solutions work, it is likely that there is a problem with your monitor or keyboard itself. Try connecting another monitor or keyboard to see if they work. If they do not work either, then there may be an issue with your computer's graphics card or drivers.