How to fix:
Can't boot from disc drive after install
Blank Screen when disc drive is selected as the boot option
Procedure:
Menu: Go -> Utilities -> Terminal.app
Navigate inside terminal window
type the command: diskutil list
It should look something like this:
Find "Apple_HFS El Capitan", read to the right:
Identifier is
disk3s2 in my example.
Write it down on a piece of paper, if necessary.
Find "Apple_HFS UniBeast Installer", read to the right:
Identifier is
disk4s2 in my example.
Write it down on a piece of paper, if necessary.
Run EFI Mounter
Mount disk4s2 ("
Apple_HFS UniBeast Installer", mount diskXXX (for you))
EFI window opens up.
Create new folder on your desktop. Name it whatever you like. Open the folder you just created.
Copy contents of the EFI partition to the Desktop
Close EFI Mounter
Right Click the EFI disc icon on the Desktop: Eject "EFI"
Run EFI Mounter
Mount disk2s2 ("
Apple_HFS El Capitan", diskYYY (for you))
Open
Desktop EFI folder that you copied to your new desktop folder (named whatever you named it to.)
Right Click/Copy
Boot Folder
Navigate to the mounted EFI folder ("
Apple_HFS El Capitan"), open folder
Right Click/Paste. Replace.
Navigate back to Desktop EFI Folder. Navigate to Clover folder.
Right Click/Copy all files
**** If your config.plist file(s) has/have already been created or modified (they will reside inside your disc EFI/Clover folder), copy all the files from the desktop copy folder but NOT the config.plist files. Move the desktop EFI config.plist file(s) outside your desktop saved EFI folder to your desktop. Highlight all the files in the desktop Clover folder, right click/copy.
Navigate to the mounted EFI window, navigate to the Clover folder, right click/paste:replace.
Close the disc Clover folder, close the EFI folder, close the EFI window.
Right click/close the EFI disc on your desktop.
Move back the config.plist file(s) your previously moved back to your copied/desktop EFI folder, into the Clover folder. (In case it should happen again you'l have them handy.)
Shutdown the PC.
Remove the USB stick. Secure it in a safe place.
Power up the PC.
It should boot. But if you had updated Clover and Clover Configurator, you will have to install them again (files will be saved to the disc EFI partition.)
If this is your first time booting from the disc drive you have the option of running MultiBeast or Installing Clover Configurator and Clover. It's probably easier to run MultiBeast, reboot, make sure everything is working correctly, then install Clover Configurator and the latest version of Clover. You would then mount the EFI partition through EFI Mounter, navigate to the Clover folder in the disk and double click the config.plist file. All changes will then automatically be saved to the disk.