Ok, this has happened:
I wanted to be prepared for the big update from Sierra to Mojave, and went thru the checklist of what to update, and so on. I updated Clover from running version 4035 to 4741 and rebooted the machine.
The Clover menu was different (red /white theme instead of grey/green) and I proceeded to boot from standard disk. Then I got a black screen...nothing else. I tried rebooting a few times, but no joy. Still just a black screen. Since I no longer have the time to use all my spare time on fixing stuff on my computer, I just turned the machine off and thought that I most likely had to start all over again. This is an operation I am not afraid of, but I don't have the time now. I need the machine to work!
After a few days, I found an old USB stick with OSX on it. I tried to boot from the USB, but nothing. Then I just started trying the different boot-options in BIOS and suddenly i was back at the old clover menu. The machine started up again, and I could log into my user. -Wow, was I happy
The sad part is that the sound is gone. I can not use Multibeast to install sound, as I get an error message every time. Video playback is also somewhat corrupted, meaning it plays a few secs, then halts, then suddenly comes back after a while, and so on.
I actually don't even know if the machine now has booted from the USB or not, but I am worried that trying ANYTHING right now, will render my machine useless again.
If there is anyone out there who could give me some good advice right now, I would much appreciate it. Why did an updated Clover cause a black screen? How did the old Clover menu suddenly appear again? Why do I have no sound and corrupted video now? Most importantly: What can I do to fix this?
I use my computer mainly for photo editing. I have Lightroom and Photoshop installed, together with loads of tweaks and updates for this and that. Starting from scratch again is something I really dread, but that could be due to the fact that I don not know any other way of doing this than installing everything over again. If there is another way, like what I think is described earlier in this post, it probably could be done much easier, but I would need a step by step guide. -Anyone?