Windows 7: BIOS/Hard Drive issue

Motherboard: Gigabyte GA-MA785GMT-UD2H rev 1.1
Hard drive's are both SATA's: western digital 1.0TB and a Segate barracuda 250GB.
Ram: Kingston DDR3 1333 4GB
Video Card: Geforce 9500 GT
Power supply and case: Cooler Master/750w

Here is the situation. When I turn on the system it goes through the bios display showing that I have one or the other or both HD and DVD connected. As it's going through it stops at the VERIFYING DMI POOL DATA..... AMD DATA CHANGE... UPDATE NEW DATA TO DMI. And there it hangs up and does nothing.

I have gone through the trouble shooting chart in the manual and found that if I disconnect the SATA cable for the HD the system goes on to display this message: DISK BOOT FAILURE. INSERT SYSTEM DISK AND PRESS ENTER.

To me it sounds like there is an issue with the SATA drives. But both!! I think I don't have the bios setup properly. I have also reset the bios. The HD's are both good and have been used on other systems with now problems, and MB is brand new.

Surprisingly I can install win 7 or run a disk manager to the HD but I can't boot from them after installing OS.

What am I doing wrong??

Was there a previous OS on either of the HD's?

See if you have a AHCI or Raid enabled in the bios - change it to sata as IDE - (UNDER SATA configuration usually)you may have to reinstall Windows 7 if the boot goes by the hard drive but still wont boot with this error - STOP 0x0000007B INACCESSABLE_BOOT_DEVICE. Just reset it back if this doesnt work.

One other, but its only if installation of Windows 7 wont continue - you say it completes so its probably not the problem, but you could try it in any case, as Windows 7 is finnicky with the MBR - you will have to do a custom install - when you reach that point delete the partition (volume) you are going to install Windows 7 to, and then create a new partition in the empty space and continue to install to the new partition- it should automatically do a quick format.

What you are describing is a failure to load the operating system.
Is OS 7 installed over a previous OS?
I suggest that you boot to bios and review your Hard drive set up.
Make sure that both drives are recognised by the bios and make sure the settings are SATA connected.
Then load your Windows 7 install disk and do a clean install.

Adrian

i would agree with what Adrian has suggested.

I would add however, run the clean cmd from diskpart prior to installation.
(It will Delete all partitions on that disc as well as DATA so be warned)

Then proceed with a clean install