Boot the Windows 7 DVD Repair console or Repair CD to run Startup Repair repeatedly with reboots.
Startup Repair should automate System Restore, but if not and it won't start then run Startup Repair from the Recovery Tools list.
If disk won't boot after setting first in BIOS, or show prompt to "Press Any key..." even after using one-time BIOS boot menu key for your model, enter BIOS setup to see if HD is detected. If so, reset to optimal defaults: Clear CMOS - 3 Ways to Clear the CMOS - Reset BIOS
If these steps fail, report back exactly what happened with each step including any error messages verbatim. We will then have more steps including testing hardware.