No boot possible after installing an additional ssd. Graphics fail.

Hey Guys,

im new here and i hope you can help me out with this really strange problem i got.

A few weeks ago i installed high sierra 10.13.6. in this pc successfully. After a few days everything worked fine. Boots were good and even graphics, sound usb and stuff worked perfectly.

Then i decided to add a new SATA SSd Samsung Evo to the working system for more dataspace. After i connected it i went to bios and checked. Everything was ok, the drive was connected and set correctly at sata port 03.

Then i tried to boot as allways but this time it failed in the booting process while apple logo is shown. The stripe works a bit and at the end there is just a restaurt and reboot.

I tried booting in verbose. It shows the screens attached. (Failed to initialize graphics firmware i think) dont know if this is the only problem.

What i did:
- i checked the boot priority. Set to my system ssd.
- checked that new ssd is set correctly as sata 3. correct.
- tried to disable gpu firmware boot in clover. (Then just the bootscreen was messed up completely and and still no booting.)
- tried fake id for both graphic cards. (Did not affect anything)
- entered secure mode (but there i was not able to make new multibeast setup)
- made a correct disc with the disc utility tool (mac os extjourn. / guid)


Now this is my system:

Asus Tuf Z-370 Plus Gaming Mainboard.
Intel core i7 8700 k , 3,7 mhz
64 GB corsair 2133 mhz
onboard m.2 ssd: system
Sata 1: samsung ssd 1 TB files
Sata 2: new built in ssd 1 TB

UEFI Bios TUF.vers. 0605

Im running the system with clover, multibeast, unibeast, kextbeast, clover configurator, lilu kext, nvidia web driver and a custom made sound kext.


Do you guys have an. Idea what went wrong?

I just plugged off the pc and put in an aditional ssd sata. Why can this cause such problems? What can i do to make the system work again?

Sorry for my bad english and just to let you know, i dont know much about this stuff here, so please explain it step by step what i have to do.

Thank you guys.

@Mj882, please update your profile (personal details) with your Motherboard, CPU and iGPU or Graphics Card(s).
If you have a prebuilt computer enter make and model instead of motherboard.

The Rules said:

Profiles are mandatory so that others can assist you.

Click to expand...

Failed to initialize graphics firmware
Try to eliminate the message by boot-arg -disablegfxfirmware

At Clover Boot Screen select Options and add -disablegfxfirmware to Boot Args

Hello Brebo,

I updated my profile. The pc was custom made. I built by my own.

thanks for your fast answer. I tried disabling the gfx firmware already, but this time, when i made a new clean installation of mac os high sierra, the command works. So For booting.
Its boots, but now i have some graphic glitches and errors, fractures and stuff like this. Sorry for my english.

It seams that now, i have no hardware acceleration anymore.

In the system preferences there is only left the intel uhd graphics 630. my Geforce GT 1030 2GB is not found anymore. Only shown: display vendor nvidia pcie. No kext loaded. (Attachment)

Maybe you have an idea how to fix this?

Thank you very much for your effort.

Now its not booting anymore, also not with your command. It shows now this and there the boot stops.