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You should connect the Intel SSD to the first Intel SATA port and not to any GIGABYTE (=JMicron) SATA port. After having done that, you should enter the BIOS and set the Intel SATA Controllers to "AHCI" Mode.
If you still get the message "bootmgr is missing", just boot off the Win7 x64 DVD or USB Stick and let Windows Setup repair the MBR.
Hello. See if the information in the following thread helps. I have an EVGA 790i mobo, and the solution was to change from the NVIDIA controller back to the "Standard" controller as in the thread below. Then my drive is seen by the tool.
Now, all is ok for my SSD . And I complete the Fernando answer by reporting that the problem of restarting after check AHCI in bios setup is caused by a Windows installation with IDE driver instead of AHCI driver. But the very simple solution is given by Microsoft Support for Vista as for Win7 here:
for french people like me . Big thanks also to this complet FAQ about Intel SSD's (in Fr) at: http://forum.hardware.fr/hfr/Hardware/HDD/topic-unique-intel-sujet_858306_1.htm#bas
the problem of restarting after check AHCI in bios setup is caused by a Windows installation with IDE driver instead of AHCI driver.
This only happens, if you change the BIOS settings of the SATA ports from "IDE" to "AHCI" after the Win7 installation.
If you do it before starting the OS installation, the in-box MS AHCI driver will automaticly be used by Windows 7 (no risk of any boot problems and no manual registry manipulation required).