A few days ago, I had working dual boot setup on a single SSD: OS X 10.11 and Windows 10, with Clover as the bootloader. (There is also a large HDD in there for file storage.) Everything was great.
I have an old 2007 MacBook Pro. I wanted to install Windows 8.1 on it, but nothing I tried would let me boot from a USB installer, and its optical drive is fried. So, I figured a workaround would be to put the laptop's drive into my Hackintosh, boot the Windows 8.1 installer there and start the installation that way. And it worked! When the installer did its first reboot, I pulled the disk out and put it back in the laptop and voila! Ancient MacBook Pro running Windows 8.1.
But, because I am lazy, I left the Hackintosh's disks connected while doing this. For some reason, after the Windows 8.1 installation, my motherboard no longer recognizes the SSD as a UEFI boot device on its own. It sees the Windows bootloader, so it can still boot Windows 10, but it can't boot Clover anymore. Both the OS X and Windows 10 partitions are in fine shape, data-wise, and I'm still able to boot them both from a Unibeast USB. I made backups at this point, just in case, including my EFI partition (which something is obviously wrong with, but at least I have my clover settings and kexts backed up).
I ran Multibeast to reinstall Clover. It completed successfully, but my motherboard still does not see the SSD as a UEFI boot device and will not boot Clover. Hmm.
After some Googling, I figured that maybe the Windows 8.1 installation did something strange to the EFI partition to make it unbootable. So, I followed Step 5 of this guide to mark my EFI partition as active using fdisk. Bad idea — now my motherboard doesn't even see the Windows 10 bootloader anymore, and my Unibeast USB doesn't see either partition as bootable. Shit.
TL;DR: In a misguided attempt to fix Clover, I marked my EFI partition as active with fdisk, and it is now completely invisible to Clover. All the rest of the data on the disk is intact. How can I make this disk bootable again?
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