Help, Stuck in PCI config end

I tried to install Sierra.
I stuck in PCI config end after i reboot from installing multibeast.

My step is below:
1. Install Sierra without insert graphic card(which is successfully load into Sierra)
2. Install multibeast
3. Install nvidia web driver
4. Enable nvidia web driver from clover
5. Switch off
6. Insert graphic card
7. Startup shown as the picture attached
View attachment 220598

CPU: i5 6500
Main Board: Gigabyte Z170M-D3H
Graphic Card: Gigabyte GTX960 4GB Xtreme Gaming...

Help, Stuck in PCI config end