Hi, Go to the Bios and you will see many entries. Just if you find Sata enabled , make it disable and try to reboot. Your problem would be solved. To go to bios either press the del key or f2. If you have different keys , do it and go to bios, where you did your memory and other test to finish totally to 100%.
If that does not fix the problem, Just have a same version of cd , as your version and insert and boot from cd , then select recovery instead of install. You will be going to cmd prompt. There you just give , if alerts 1 and to the next , just enter to go to c: There you type fixmbr and enter. If alert that it will change your mbr, choose yes . If will rewrite the correct mbr and it will boot normally. Try these and let me see how it goes