No Hyperv Virtuals get DHCP address - but Physical Host Can

HyperV Server 2012 Core on a dedicated machine on local domain.
Machine connected directly into local network that has a DC running DHCP.
None of the VM's can get a DHCP Address from the server. Even if i set static addresses still they cannot route anywhere, cannot even ping the HyperV server they are sat on but other local machines can!!!!
The physical host cant ping the 
The physical HyperV server has no problem getting a DHCP address or any routing issues, nor do any of the other clients on the local network, including another HyperV server running server VM's
What ive tried so far
Deleted Virtual Switch and removed the NIC from the virtual hosts in HyperV Manager- then re-adding new one.
Put in a different network card
Removed Physical host from Domain, renamed machine to different name and re-joined
Used different IP addresses for the Physical host
Reloaded the HyperV server from scratch and created new VM.
Ive had HyperV previously running on this machine without problem, so now i cant see why i cant get it running again.
Anybody have any suggestions on what i can try next, im all out of ideas.

Hi Fulgent,
I am assuming that , the hyper-v server have two NICs , one for host and the other one  was  configured as an external switch for VMs .
If the VMs can not access the dhcp and local network , please try to  delete the external switch then uninstall the Physical NIC in device manager and  click " scan for hardware changes " to reload it.
Try to create external virtual switch for VMs again .
Any further information please feel free to let us know .
Best Regards
Elton Ji
We
are trying to better understand customer views on social support experience, so your participation in this
interview project would be greatly appreciated if you have time.
Thanks for helping make community forums a great place.

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