Resolved I installed a SSD in Windows 7, but the motherboard doesn't see it.

My motherboard is an EVGA X58 SLI LE, also known as model 141-BL-E757.
I installed a Samsung 840 EVO(250meg) solid state drive. Windows 7 (Ultimate) 64 bit, promptly recognized it, installed drivers.
I right clicked Computer, the clicked Manage, then Disk Management. I initialized the drive, formatted it. Using Samsung CD's Data Migration Tool, I copied my primary drive to the SSD.
I was hoping to keep the primary drive, a 300gig WD Velociraptor, and the SSD both connected, and choose the SSD as the boot drive during POST.
The SSD does not show up as a boot option.
In BIOS, the HD is selected as an IDE device. Having read that SSDs like to be selected as ACHI, I switched to ACHI, and the Samsung SSD showed up in BIOS.
During reboot, I ended up on a page I have never seen before. It has a red background and is reminiscent of the blue screen of death. Windows did not boot successfully, and I ended up on a page that gave me the opportunity to repair the installation.
This I did, then went back to BIOS, reset the HD to IDE, and Windows booted successfully from the original WD Velociraptor.
How do I get the computer to boot from the SSD?
Do I need to disconnect the Western Digital Drive?
Thanks.

 

Thanks, Arie, for the quick reply.
After I make the registry change, will the SSD show up under boot options?
I assume that the registry change will be made on the registry that resides on the WD Velociraptor.
If I interrupt the POST, and select the SSD as the boot device, will I then have to go back into the registry that resides on the SSD, and make the same change again?
I was hoping to keep both the SSD and the WD in the system, and boot to one or the other at my discretion. Eventually, once I feel that the SSD is functioning properly, I plan to extract the WD or just format it and use it as a storage device, or just a backup.

 

Thanks Arie. I will give it a try later today, and will most certainly let you know if it went successfully.

 

Before I actually start, Arie, please tell me if this plan will work: Edit the registry value. Shut down the computer. Disconnect the WD300 HD. Move the SATA cable from the WD300 to the Samsung SSD. Boot the computer, and enter into the BIOS. Change from IDE to AHCI. Save, exit, and continue to boot into windows.
At this point, did I not lose the registry change? Am I wrong in assuming that the registry that I did modify resides on the WD300-which is now gone?
If so, then booting into Windows on the SSD should fail, as the registry has not yet been modified on it.

 

Arie, I hope you don't lose patience with me, but I am evidently misunderstanding something basic.
My computer is up and running in Windows, booted from the WD300. It has the WD300, the SSD, and a third drive, all connected and displayed in Computer Management>Disk Management. BIOS is set to IDE, so the motherboard only sees the WD and the third(Hitachi).
Within Windows Computer Management, I see:

If at this point, I modify the registry-I'm under the impression that I'm doing it on the WD drive, since this is the drive from which the computer is presently booted up. Is this a false assumption?

If, after modifying the registry, I shut down the computer, disconnect the WD, and put the SATA cable that it was connected to into the back of the SSD, power up the computer, enter BIOS, change the IDE to ACHI, save, continue to boot(now into Windows on the SSD which hasn't had the registry modified yet), will Windows boot successfully, so that I can now modify the registry on it?

I guess I just don't see what was accomplished by modifying the registry on the WD300, if the first thing I do then is to disconnect it.

Or, are you saying that I should disconnect the WD first, power up the computer, change IDE to ACHI, then boot into Windows on the SSD? Will this succeed, if I hadn't yet modified the registry?

 

I disconnected the WD drive, took its SATA cable and connected it to the SSD. When I turned the computer on and went into the BIOS, I saw that the motherboard had now recognized the SSD, even before I had the opportunity to change from IDE to ACHI. I then changed the setting from IDE to ACHI, saved and exited, and the POST got as far as the Starting Windows screen, where two of the four colors that eventually become the "flag" began to circle. The screen froze very briefly, there was a flash of blue(BSOD?) and the POST started again. It did this about three or four times, until I stopped it by powering down the computer.
I then disconnected the SSD, reconnected the WD, and changed ACHI back to IDE.
The computer is now up and running as before I started the installation.
You state that I should start from scratch and migrate the OS to the SSD drive "(having made sure that you operate the WD drive without the SSD drive attached) ".
How is that possible?
I should mention that the Installation Guide shows the data migration utilizing a short cable that has a USB plug on one end and a combination SATA+POWER plug on the other end. I did not get this cable, as I only purchased the bare drive. For an added cost, the drive can be purchased with a kit that includes this cable, among other hardware.
I simply installed the SSD internally and used one of the power plugs and a SATA cable from the motherboard. Surely that couldn't have made the difference and cause me the installation problem?
Please let me know if reconnecting the SSD via a SATA cable and migrating the data again is the correct way to go.

 

It worked, Arie! Thanks. I really appreciate it.