My parents recently acquired a Gateway DX4860 with Windows 8 64 installed. Because I need to provide them with support, I want to install Windows 7 64 Pro on it, as that is what I have on my machine. I took the HDD out of the Gateway, put it in an empty bay of my machine, and using Acronis, deleted all the partitions, and reformatted it. It now showed a single partition in disc management. I put it back in the Gateway, and successfully installed Windows 7 64 Pro from a newly purchased OEM disc. All seemed fine. However, upon reboot, I got a black screen with the words "Reboot and Select proper Boot device or Insert Boot Media in selected boot device and press a key" on it. Using the recovery tools on the W7 disc, I got it going again, setting the (only) partition as active using diskpart.
But, it keeps happening. Boot priority is fine in the BIOS (HDD #1). However, when I navigate to the “Hard Disk Drive Priority” option in the BIOS, the drive does not show up. However, it does show up in the BIOS as being present in AHCI Port0.
I suspect it has something to do with UEFI or BIOS settings or some double secret partition on the factory HDD.
I would appreciate any clues. My next step is to try it with a fully fresh HDD.