ESXi hangs at dma_mapper_iommu

Hi all, I'm very novie to VMware and have always been a little sceptical of experimenting thigs out.

I have ESXi 6.0 and I usually connect to it via HTTPS or by using vSphere client.

i tried to Passthrough my Nvidia GT950 on it with a Windows 10 VM. Once I rebooted the ESXi it now hangs at dma_mapper_iommu_succesfully_loaded message.

I cannot HTTP, SSH or use vSphere now.

Is there a way I can revert the chenges I made before the machine was rebooted?

I've seen many posts on this but no one seemt o have any clear cut info.

Appreciate some help.

Thanks.