What is wrong if the power light of a computer and monitor is on but nothing comes up on the screen when you start your computer?

If your computer starts but displays nothing, you should check is if your monitor is working properly. Check the power light of your monitor to verify that it’s turned on. If your monitor won’t turn on, unplug the power adapter of your monitor, and then plug it back into the power outlet.

Does CMOS battery stop PC booting?

No. The work of CMOS battery is to keep date and time up to date. It won’t prevent the computer from booting, you will loose date and time. Computer will boot as per it’s default BIOS settings or you will have to manually choose the drive where the OS is installed.

Why does my computer turn on but no display on monitor?

If the input voltage for the power supply is not correct (based on your country), your computer turns on but no display on monitor or keyboard. (You might be interested in this post: What is a Power Supply Voltage Switch?) If this switch is wrong, it is very possible that your PC wouldn’t power on at all.

What should I do if my mouse is not turning on?

Hold the power button in for 15-20 seconds. Plug in the mouse and the keyboard and then the power cord and check the green light in the back to make sure it is on. Then try to power the unit by pushing the power button again. Recheck the green light in back to see if it is still lighted.

Why is my computer screen blank after connecting to another monitor?

You need to verify the issue is not the monitor. If connecting your PC to another monitor results in it working then the first one you tried may be busted. If it still shows a blank screen on an another monitor then there are some more steps to take. Check the Cable Next, double-check the cables for both the monitor and the computer.

What to do if your computer is having no display?

Method 4. Perform a hard reset. If your computer is still having no display even after checking the monitor and verifying that your PC has fully power cycled, you can try booting into safe mode and then repairing Windows either using System Restore /Automatic Repair or resetting your computer.