Sometimes formatting the HD is not enough if there is corrupt code on the boot sector. Try wiping the HD: SSD - HDD Optimize for Windows Reinstallation.
Next try resetting the CMOS: Clear CMOS - 3 Ways to Clear the CMOS - Reset BIOS
to Optimal Defaults.
While in BIOS setup, set SATA controller to AHCI to try install. Unplug all other HD's and peripherals.
Where did you get Windows 7? Did you burn the DVD yourself? Confirm ISO integrity or download another. Burn another DVD using ImgBurn at 4x speed, or write to flash stick using Universal USB Installer
with Windows 7 in dropdown menu - boot under USB, Removable or HD's using one-time BIOS Boot Menu key.
Report back results for each step given as there are more depending upon this.