Unfortunately this computer belongs to my sister and she's too far away for me to help her physically there. I set up this pc with a dual boot using rEFInd as the boot manager. But now she says only a plain black screen shows when she turns the pc on. And hitting ESC won't do a thing.
I'll try to go to the BIOS with her help and see if swapping the drives could help loading Windows. If she then get the EFI menu with F12 to call Mint that would be great!
I believe she has a Life Mint USB drive too.
Any thoughts?
Thanks in advance guys
DPC
Remove Refind Osx
The rEFInd Boot Manager: Installing and Uninstalling rEFInd. Smith, rodsmith@rodsbooks.com Originally written: 3/14/2012; last Web page update: 3/13/2021, referencing rEFInd 0.13.2. After I installed rEFInd to triple boot my MF839 Macbook (Win10, Ubuntu, OSX), to enable Virtualization on Windows 10, first I boot to OSX, then when it's login screen appear, I hit the restart button so the mac restart again then I choose Windows 10 from rEFInd. Minimalistic rEFInd theme. REFInd is an easy to use boot manager for UEFI based systems. Mac os free ftp client. This is a clean and minimal theme for it. Locate your refind EFI directory. This is commonly /boot/EFI/refind though it will depend on where you mount your ESP and where rEFInd is installed.
Or you can get the latest macOS Catalina on the App Store for other versions including High Sierra (10.13), Sierra (10.12) or El Capitan (10.11). If you’re using Lion (10.7) or Mountain Lion (10.8), you will need to upgrade to El Capitan (10.11) first before you could upgrade to macOS Catalina. 
Refind Download Os X
If your rig gets stuck on rEFInd error, you must set FAST BOOT to DISABLE in your motherboard bios. If your rig fails to boot due to initramfs error, EFI Shell error, /dev/disk/. Does not exist error, or boots directly to BIOS, proceed with the below guides: For USB Drives. Power off your rig.