Once Mojave is installed, which includes its own firmware update.your 5,1 will have the most up to date firmware and it will work.but when you boot, you see a black screen for longer time and the screen won't come on until just before the desktop, it will come on long enough to the the apple progress bar for 10 seconds or so.then you'll be in Mojave and it will work fine after that. I remember vaguely for the Mojave update, I had to wait a long time, and possibly I had to reboot a couple of times, and I started freaking out, clearing the NVRAM and what not, it would always come back to black screen and I thought maybe I had bricked my Mac, but looking around on the net I found other people with similar experiences, but it all worked out in the end.I can't remember exactly the details, sorry it was a few years ago I did that.But it will get through it. There will be long periods of black screen and it will be very disconcerting, but let is run at least an hour whenever it gets stuck on a black screen and you're not sure why. The Mojave update requires a metal card.and you will not have a boot screen. That is about the same experience you will have booting Mojave. when you are booting HS with metal card, you will notice that the screen will be black for a longer time, then turn on graphics just before the desktop comes up. Once you have HS installed, swap the cards and run HS with the metal card, should work fine. HS supports a metal card, but not for the update process.

HS update, includes firmware that enables APFS, among other things.

So it will have a boot screen and you will see that its updating firmware, etc. HS update requires your OLD card to do the update.

So as JohnG said.make sure you go to HS first, I think maybe you already are on HS, I can't remember now. Click to expand.ps - the only time I was a little bit annoyed by the Black Screen effect, was basically when I was installing Mojave.there is a firmware update that needs to happen and with the metal card, you will just see a black screen while you wait for what seems like forever.Īlso under Mojave, the recovery mode would sometimes not come up unless I cycled the power on my monitor, you just stare are a black screen and wonder what is happening.īut for the most part, you can boot up fine with a black screen, you can get to recovery mode by just waiting long enough (and maybe cycling power on your monitor, I found it is particularly a problem when I have both a DP and DVI monitor plugged in at the same time), you can reset NVRAM, etc.all the same stuff as before, but you just have to sit and wait while you stare at a black screen and be confident that its doing what its supposed to be doing.until it finally lights up the screen.įor multi-boot, you can always go into the startup disk screen in OSX, set the drive you want it to boot to and then restart.rather then using the Apple boot screen to do it.Īnyway, what in particular are you having an issue with?

Mac pro 5.1 metal gpu