If you can't boot disks or flash stick
most of the time it's due to User failure. Set the Hard Drive as first device to boot in BIOS setup then trigger the disk or flash stick using the one-time BIOS Boot menu key given on first screen or in Step 9 above. If no such key or key doesn't work then set DVD drive first to boot in BIOS setup, Save changes, exit. How to Boot A Computer from CD or DVD - YouTube
Place DVD/CD in drive, reboot. Do you receive the prompt to "Press any key to boot disk?" If not the disk may not be burned correctly. Try ImgBurn
at 4x speed.
Flash stick may be listed under USB, Removable or Hard Drives and often requires expanding + one of these to see all choices, is normally listed by brand name.
Reset the BIOS to defaults after taking note of SATA controller setting: Clear CMOS - 3 Ways to Clear the CMOS - Reset BIOS
. Try disk again.
Try booting flash stick installer which should be listed in BIOS Boot order or Boot Menu under USB, Removable or HD's for: OS repairs or reinstall, WD disinfection, Partition Wizard repairs. If these fail try unplugging DVD drive.
As a last resort you can replace the DVD drive, or rescue your files with Paragon Rescue CD which will boot itself, then boot Partition Wizard bootable CD which will also boot itself to wipe the HD
, which will in turn force the installer to boot itself for reinstall.