OK - I have been playing with this for a while. It appears that its related to the Quadro graphics card. I deleted the original VM (not the disk) and created a new VM without a GPU attached. Manually pointed to old Vdisk or whatever it is called. Booted up fine, able to access. Shut down VM, added GPU, restarted and issue.
So the issue was not entirely related to RAM, however I do need to add more. For some reason, whenever the GPU is attached to the VM, it refuses to boot.
I have the Quadro graphics card for the VM, and the Intel iGPU (12600) for plex.
Never had to click the bind button on the system tool page, but have looked into that now. Still no success.
I have left the GPU disconnected from the machine and will await further assistance
Update again - Attached GPU, plugged monitor into GPU, for some reason no IP assigned to NIC, assigned IP to VM and all working... All from trying to change the ram from 8gb to 12gb. No idea where it went so wrong.