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planetwilson, see my message a few back about the update. You HAVE to select the right boot option on clover or it won't work. I said that I was having exactly the same problem.

Spx404, do some searches or read through this message thread. Well I don’t remember what the answer is, I could swear that there was something posted about what to do if that happens. Maybe I’m wrong, but I’m pretty sure. If not, I’m sure someone on here can make a suggestion.

Has anyone been having any weird oddities with their NVIDIA GPU in High Sierra? I definitely can’t boot MacOS with 2 displays connected. With a single display, it loads and works fine, but then occasionally the display will just go black for 4-5 seconds and then come back on. Once in a while, the display actually go black and then my screen says there’s no signal. This is with only 1 connected. To correct it, I have to pull the HDMI cable for a few seconds and plug it back in. 2 Displays has some oddities too after the OS loads. Whether on mirror or not, when plugging in the 2nd display the screens will only sometimes go to snow, then black, then back to snow and then to the proper display. Sometimes I need to pull cables and plug them back in to get the correct display. I love everything else about this install, but the video issues are just weird and can be annoying. I’d post this elsewhere, but I’m assuming the problems with the display are related to High Sierra being that I’m having issues with single display and everyone says Sierra works perfect. I have not seen any threads specific to High Sierra and NVIDIA gpu passthrough problems.

Anyone have any luck with dual monitors? After my last post, I have ALL of my passthrough hardware working correctly. I passed through one of the USB controller on my motherboard and that is working wonderfully. I passed through 2 different NVIDIA GTX 960 video cards. 1 is an MSI and the other is a Gigabyte and have had the same results with both cards. If I boot with a single display connected, everything works as expected. If I boot with 2 displays plugged in, after the apple logo loading screen, the displays go blank and say there is no signal. If I boot single display and then hotplug the second display, I have to play games with the hotplugging to get them to work. They go snow, then 1 will show the desktop, then snow, then the other shows the desktop. Eventually, after 3 or 4 tries, I can et both displays to work correctly. If anyone else has any experiences with dual monitors and/or knows of a fix or somewhere to look, please let me know. I did do a couple of searches, but didn't find anything specifically related to High Sierra. I also found some details about AMD cards, but not NVIDIA. I must say that I am extremely happy otherwise with my build. I have an Unraid server, my game machine and my daily Mac desktop all on 1 piece of hardware and it's all running really smooth and snappy. The graphics performance on both operating systems is phenomenal, even when using both at the same time. I have not noticed any drive performance issues either, even when copying some pretty large files over from my old gaming PC and still working on my Mac install at the same time. Thanks so much for your information and guidance gridrunner.

Thank you for the info David! I've been trying to get my Mac VM installed and running since Sunday. Probably tried 15 times since then to get the 10.13.2 update to work. VERY IMPORTANT TIP for anyone else...... You have to use the "Install from <Hard Drive>" option at the Clover menu for this to complete right. I'm no expert with Clover, but all the other attempts, I let it do the automatic selection with the Preboot Install option and it always hung with the progress bar about 1/8 of the way across. For informational purposes, this was a clean install of High Sierra following the video. No custom anything until I got the update to run. I tried q35-2.9 and 2.10. I tried multiple Clover versions starting at 4200 up to the current of 4334. Nothing had any affect until I tried the "Install from HD" menu option in Clover. I've also had mixed experiences with the VNC mouse cursor. New install 4 times through this process. First attempt, cursor sync was fine. Next 3, it's all messed up. 1 time in between, when I had changed q35-2.9 to 2.10 in the XML file, the cursor fixed itself. No other changes on that boot, but the cursor was syncing fine. Right now, it's messed up, but if using NoMachine, Splashtop or Mac Screensharing from another Mac the cursor works fine. I'm only using the built in VNC to access the clover menu. After that I switch and normal boots, I don't need to select anything on the Clover menu, so it won't matter. Happy to finally have it installed and fully updated! Everything appears to be working great! Off the get my passthrough devices working so I can use this for my daily desktop machine instead of my older Macbook Pro.

I would like to submit my findings on this topic as I came across this thread when I was research the same question. I have a Mac Pro 4,1 (early 2009) that I have updated the EFI Firmware to be a 5,1. Both before and after the update, my Mac refused to boot from a MBR configured usb flash stick. I was able to take the Unraid flash device and boot my '14 Macbook Pro from it, but the old Mac EFI just won't do it. I DID manage to boot the Unraid install from an SSD, connected to an internal SATA port, but..... Unraid doesn't support this option for use. You HAVE to have the USB flash device to save the configuration to as the system refuses to use the internal SSD after it's booted and the system is loaded into memory. I did read a post from Lime Tech saying that they do not support booting form an internal drive. Being that I had it working, all but saving my configuration for the next reboot, I went on a mission to find a way to make it work. I found this link: http://www.ostricher.com/2012/09/setting-up-unraid-vm/ After reading through it, I tried that method too. I booted ESXi from a USB flash drive, used the empty space on the flash drive to create a datastore and then configured PCI Passthrough on the 6 port SATA controller AND my USB 3 PCI card. While I did get it to boot and it worked, it was definitely sluggish because of all the extra processing occurring with Unraid being in a VM. The setup process DID get me thinking of an option though. In his guide, Itamar explained how he used Plop Bootloader to make VMware boot directly of a USB device, which was otherwise, unsupported and impossible. THIS got me thinking. I did a ton of reading about Plop Bootloader and the methods of installing it and using it. Ultimately, I needed a syslinux boot loader to load Plop Bootmanager, which I had already configured to stay hidden and load my USB flash drive directly. I HATE dealing with Grub and Grub2 and in general, boot loaders are not my thing. I found a thread talking about an app called YUMI to install a MULTIBOOT ISO boot manager with syslinux and you can boot any ISO or live ISO of linux and all kinds of operating system. The downside is that YUMI is a Windows app, but what the hell, right? I took my SSD that I had booting before, wrote the new MBR to the disk with syslinux and MULTIBOOT which then opens Plopbootloader as hidden and loads UNRAID. It sounds complicated, but the boot process literally takes about 40-50 seconds to get to the UNRAID boot. I modified MULTIBOOT's menu to skip everything, timeout after 3 seconds and load Plop by default with no keyboard interaction. I think the amount of time it takes for UNRAID to start loading is about 30 seconds now. How often do you really reboot a NAS anyway? The bootloaders have nothing to do with the system once it's running. There is 2 negatives to this and neither affect me at all. 1. I have to waste an internal SATA port JUST for the MBR and bootloader. 2. I'm using an SSD for nothing else, other than the bootloader. I have 5 other internal SATA ports which are all being used for my disk Array and I have a 4 port, USB3 PCI card which I have a 4 drive external enclosure on and still have the ability to connect another enclosure, invidiual drives, etc. Ultimately, UNRAID is running perfectly on my 2009 Mac Pro 4,1 with 32 gb of ram and 20 TB of storage space on the array with 2 TB of ssd cache space. I think that's a pretty damn good setup. I'm also sure there is an easier method to get Plop Bootmanager loading on the internal disk, but every possibility I tried to load it from USB flash drive failed. This Mac Pro (and assuming others of this age and older) absolutely refuse to boot from an MBR partitioned USB flash device. Here's a link with a tutuorial on using YUMI: http://smyl.es/tutorial-how-to-build-the-ultimate-custom-usb-drive-with-multiple-bootable-installs-for-windows-and-linux-and-portableapps-for-windows/ And the download link here: https://www.pendrivelinux.com/yumi-multiboot-usb-creator/ Hopefully my info will help someone else make use their old Mac Pro or other old Mac. They are very solid machines!