Help with troubleshooting

[Gregow]

So, I'm at my wits end here hoping some clever Mac-wizards can help me find a solution. Apologies for a long post, but let me start at the beginning.

 

I could not find a suitable forum as this pertains to both install and post-install. Anyhow...

 

A while ago I decided to make a fresh install of Sierra. I had been running it for quite a while, through several updates, and figured it would be nice to start fresh. 

 

I've done this many times in the past, with the same installation media, with the same procedure and on the same hardware. 

 

Got everything installed OK. Did the post-install with Rampagedev's X99.dmg, installed the latest version of Clover. Aaand, I can't boot from the EFI on my SSD. It only works. when booting from the USB-stick. From the SSD I only get to:

 

 

 

OsxAptioFix2drv: Starting Override for \System\Library\CoreServices\boot.efi

Using reloc block: no, hibernate wake: no

++++++++++++++++++++++++++++++++++++++++

 

After that the computer just hangs or reboots.

 

I've tried with OsxAptioFixDrv, OsxAptioFix2Drx and OsxAptioFixDrv-free2000. Same thing, except OsxAptioFixDrv actually gives a memmap error.

Tried updating BIOS to the latest version with no difference. I have also replaced my old GTX 970 with a 1080 Ti.

 

I tried copying the EFI from the USB-stick to the EFI on the SSD. Same thing - it just won't boot. Except once or twice, running very unstable.

 

Booting from the USB is no walk in the park either. It fails frequently, though later in the process (at seemingly random stages). Sometimes it fails to load the webdriers, other times it freezes at the login screen. Network connection is sometimes barely usable and Safari is very unresponsive.

 

Kind of odd for a machine that's been running well for a long time and an installation procedure I've relied upon many times.

 

Trying to re-install Sierra works equally bad. 

 

Now I get tons on "Sandbox violation" errors. Even if the installer starts is usually unusable. Like, can't use disk utility or actually start the installation. I just get the spinning wheel.

 

I've checked the BIOS, disabling CSM and secure boot as well as VT-D. Makes no difference. Reverted back to optimized defaults. Same thing.

 

Something is clearly messed up, and for the life of me I can't figure out what.

 

And for the record, I'm running Windows without any issues. Hardware is stress-tested and memory seems to be running fine. 

 

Do you have any idea what could be causing this? Maybe you have some clever suggestion that I haven't tried yet?

 

I have the following hardware:

 

Asus X99-A

I7 5820K

Asus STRIX 1080 TI OC

16 Gb (4ch) Corsair Vengance LPX

[Gregow]

I've made some slight progress. By using OsxAptioFixDrv-free200 and Nick Woodhams (I think) Test2.efi I was able too boot fine. Can't recall I've ever used that combo before, but whatever. Some progress was made at least. 

 

Also updated to High Sierra now that webdrivers are available. Issues now are something with the apfs driver and "geforcesensors". But I suppose such queries are better handled in the apropriate forum.