Boot failure.

I'm sorry to hear that you're experiencing boot failure. This can be a frustrating issue, but there are several steps you can take to try and resolve it. Here's a general troubleshooting guide:

1. Check External Connections:
   • Ensure that all cables (power, data) are securely connected to your computer and monitor.
   • If you're using a laptop, make sure the battery is charged or connect it to power.
2. Remove External Devices:
   • Disconnect any external devices (like printers, USB drives, etc.) and try booting again. Sometimes, a faulty external device can cause boot issues.
3. Check BIOS/UEFI Settings:
   • Enter the BIOS/UEFI settings by pressing a key (like F2, F12, ESC, or DEL) during startup.
   • Ensure that the boot order is set correctly (usually, the primary boot device should be your hard drive or SSD).
4. Boot into Safe Mode:
   • Try booting your computer in Safe Mode. This will load a minimal set of drivers and may help identify if a third-party software or driver is causing the issue.
5. Repair Windows (or your OS):
   • If you're using Windows, try using the Windows Recovery Environment. You can access this by booting from a Windows installation or recovery disk.
6. Check for Hardware Issues:
   • If the above steps don't work, it might be a hardware problem. Check if your hard drive or SSD is properly connected. If it's a desktop, try reseating RAM and other components.
7. Run Diagnostics:
   • Many computers have built-in diagnostics tools. Check your user manual for instructions on how to access and run these tests.
8. Reinstall the Operating System:
   • If none of the above steps work, you may need to reinstall your operating system. Make sure to back up your important data before doing this.
9. Seek Professional Help:
   • If you're not comfortable performing these steps on your own, or if you suspect a hardware issue, it's best to seek help from a professional technician.

Remember that the specific steps may vary depending on your operating system (Windows, macOS, Linux) and the make/model of your computer. If you provide more details about your system, I can give more specific advice.