System not responding, please help!

[fbellic]

Hi everyone, I am new here so first of all thank you all for your help.
Here is my problem, I got stuck and I am getting crazy here so I hope someone can help.
I have a dual boot Intel based PC, with Windows 10 loaded on an SSD drive. Then I have a second SSD drive where I used to run MAC OS Yosemite with Chimera bootloader.
When I upgraded my video card to an NVIDIA GTX1080, the MAC OS stopped working properly, so I tried to upgrade the OS to El Capitan but I probably messed up something along the way and now the MAC OS does not start anymore. Windows 10 was not effected and still runs perfectly.
I tried to create a bootable USB following the guides but several attempts never worked out.
If anyone can help to restore the MAC OS on my second SSD it would be greatly appreciated, I don't have any particular data to save on that drive so I don't mind if I have to format it for a clean installation.
Thank you all for your help!

 

[UtterDisbelief]

Hi everyone, I am new here so first of all thank you all for your help.
Here is my problem, I got stuck and I am getting crazy here so I hope someone can help.
I have a dual boot Intel based PC, with Windows 10 loaded on an SSD drive. Then I have a second SSD drive where I used to run MAC OS Yosemite with Chimera bootloader.
When I upgraded my video card to an NVIDIA GTX1080, the MAC OS stopped working properly, so I tried to upgrade the OS to El Capitan but I probably messed up something along the way and now the MAC OS does not start anymore. Windows 10 was not effected and still runs perfectly.
I tried to create a bootable USB following the guides but several attempts never worked out.
If anyone can help to restore the MAC OS on my second SSD it would be greatly appreciated, I don't have any particular data to save on that drive so I don't mind if I have to format it for a clean installation.
Thank you all for your help!

Hi there.

Firstly you need to complete your hardware Profile with details of your motherboard, CPU and GPU (at the least). It's a part of the Site Rules and will be vital to others wanting to help.

Secondly - a UniBeast flash-drive is the way to go so that you can boot your macOS installation and repair it - possibly by re-installing Clover bootloader.

 

[P1LGRIM]

When I upgraded my video card to an NVIDIA GTX1080, the MAC OS stopped working properly, so I tried to upgrade the OS to El Capitan

Your GTX 1080 is not supported in El Capitan, you need at least 10.12.4 and the appropriate Nvidia web drivers.