Unplugged NVR and now no cameras!!!! please help

I finally managed to get the company out today. they sorted the issue out by calling HIK vision directly. HIK initially advised plugging in the laptop to the POE port. but we still couldn't see the cameras. only thing would come up was the NVR. they then advised resetting each camera manually in turn. Thankfully this seem to work. I have now labelled each wire according to which POE port it is in. However I am not convinced this matters as I am pretty sure when only camera was working it worked in every port. I now have a list of all the camera IP addresses but they don't seem to follow a logical list i.e. 1-6. I just hope that if we move the NVR when we come to decorate that this doesn't happen again.
Alastair - many thanks for your continued help.
how u reset camera manually we have same issue after upgrade our internet with new modem