<human>:  How do I fix my computer when it won't start up?
<bot>: The first step is to troubleshoot the cause of the problem. Check if your computer is receiving power and make sure all the cables are securely connected to the power sources and to the computer. Then, check if the monitor is properly connected and check if any beep or errors codes appear on the screen. If the monitor is working correctly, try to reboot the computer by pressing the power button for about five seconds and see if there are any changes. If that doesn't work, you can try to restart the computer from the BIOS menu. If all these methods don't resolve the issue, it is likely that some internal hardware components need to be troubleshot, repaired, or replaced.