1. Check the Power: The first step in troubleshooting a computer that is not booting correctly is to check whether or not the computer has power. Make sure all power cords are securely connected and nothing has been switched off at the wall. If there are separate power cables for the monitor, make sure these are connected too.
2. Monitor Display: Check if the monitor is powered on and displaying anything. If it is displaying any type of information this could indicate a problem with the computer’s software or hardware.
3. Input Devices: Try rebooting the computer using an external keyboard and mouse. This will let you determine whether or not there is a problem with the internal input devices.
4. System Reset: If possible, try resetting the system by unplugging all the cables from the motherboard and then plugging them back in. This will help to reset any temporary problems caused by a power surge or glitch.
5. BIOS Settings: Many computers will present a list of diagnostics and setup options when they first start up. Enter the BIOS settings menu to check the options available. This can help you diagnose any software or hardware issues.
6. Run Diagnostics: Some computers have built-in diagnostics that can be used to help troubleshoot hardware problems. Check the documentation provided with your computer to see if this is available and how to run the diagnostics.
7. Memory: If the computer has no display or access to any other diagnostic options it is likely there is a problem with the RAM (random access memory). In this case, you will need to remove the RAM sticks from the motherboard, one at a time, and replace them.
8. Hard Drive: If the computer still does not boot correctly, it is likely that the hard drive is the problem. You can try connecting the hard drive to another computer to check whether it is still functioning correctly, or connect an external hard drive to your computer as a backup.
9. Software Corruption: If none of the hardware troubleshooting options have worked, there could be a problem with the operating system or software installed on the computer. If you can get into safe mode, this could help you diagnose any software problems.
10. Hardware Problems: A hardware problem is more difficult to diagnose, but it may be worth checking out if all software troubleshooting has failed. If possible, try replacing the existing hardware with known working components and see if the problem persists.
11. Take it to a Professional: If you have exhausted all of the above options and the computer still will not start, it is likely time to take the computer to a professional for a comprehensive diagnosis. A qualified technician will be able to identify any underlying issues and recommend a solution to get your computer back up and running.