Hello! I'd be happy to help you troubleshoot the issue with your bootable USB not being recognized by your laptop. Here are some steps you can try to resolve the problem:
1. Check the USB port: Make sure you are inserting the bootable USB into a working USB port on your laptop. Try inserting it into a different port to see if it gets detected.
2. Check the boot order: Restart your laptop and access the BIOS or UEFI settings. Look for the boot order settings and ensure that the USB drive is listed as a boot option. You may need to prioritize the USB drive over the internal hard drive.
3. Recreate the bootable USB: There may be an issue with the bootable USB itself. Try recreating the bootable USB using a different tool like Rufus or BalenaEtcher. Make sure to use a known working ISO file of the operating system you want to install.
4. Check the USB drive: Test the bootable USB on another computer to see if it is recognized and boots successfully. If it works on another computer, then the issue may be with your laptop.
5. Update BIOS/UEFI: Check if there are any BIOS or UEFI updates available for your laptop. Updating the firmware may resolve compatibility issues with booting from USB devices.
6. Try a different USB drive: If possible, try using a different USB drive to create a bootable device. Some USB drives may not be compatible with certain systems.
7. Disable Secure Boot: In the BIOS or UEFI settings, try disabling Secure Boot if it is enabled. Secure Boot can sometimes prevent unrecognized boot devices from being used.
8. Check for hardware issues: If none of the above steps work, there may be a hardware issue with either the USB port on your laptop or the USB drive itself. In this case, you may need to seek professional help.
I hope these steps help you resolve the issue and successfully boot from your USB drive to change the operating system on your laptop. Let me know if you need further assistance!