My son and I built a Windows 7 Pro gaming computer for him recently. It's been up and running for two months now. It has a Samsung SSD as the system drive, and a WD Caviar Black 1TB drive for storage.
Recently, I needed some temporary space to store a drive image of a drive from another computer. I asked my son how much space was available on the WD drive, and there was more than enough for the image. He removed the WD drive and gave it to me. I connected it to another windows 7 Pro computer, made an image with Acronis True Image, and stored it in a folder that I gave a custom name on the WD drive.
When I was finished, it turned out I didn't need the image any more, but left it on the drive. My son had not attempted to start his computer since removing the WD drive. He reconnected exactly as it was previously, and started the computer.
After the BIOS screen, it reports (white text on a black screen) "A necessary device is missing..." and we can only restart. And I have since found that the drive was not only used for storage. There are Program Files and Program Files (x86) folders on the drive from the installation of things like Win Zip, Libre Office, etc.
I went into the BIOS and the Samsung SSD and the WD drive are visible. The Samsung is first up in the boot order.
We booted from the same Windows 7 Pro DVD that was used to originally install Windows, and attempted to go into "Repair my computer". It reports that the version of the Repair Console on the DVD is not compatible with the installed version of Windows and suggests to get a compatible DVD to run Repair Console.
Next, we attempted to do a Repair Install of Windows 7 by selecting Install Now and the Upgrade Option, but of course found out that the Upgrade option can only be run from within Windows (this according to the setup program).
So now I am wondering what to try next to save my son's installation of Windows. Any suggestions appreciated. I think I have listed everything here that we have tried. Thanks for any help.