Confirm the ISO or download another file and burn it to DVD using ImgBurn
at 4x speed.
Unplug all other HD's and peripherals, enter BIOS setup to reset to defaults, set SATA controller to AHCI.
Boot the DVD by setting DVD drive to boot first in BIOS setup, or using the one-time BIOS Boot Menu key given on first boot screen. You should receive a prompt to "Press any key to boot disk." What happens then?
If this fails you can eliminate the installer as cause by writing the ISO to flash stick using Universal USB Installer
with Win7 in dropdown menu. Boot using one-time BIOS Boot Menu key under USB, Removable or HD's.
If these fail next try wiping the HD using Diskpart Clean Command
accessing DISKPART At PC Startup.