I have nvr-elhs-64-4k-dh with 2 poe's and about 25 cameras.  Everything was working fine until the other day.  All cameras quit working, both p.o.e's arent lighting up on the camera connections side.  Device search on the nvr is showing no devices, i bypassed the network switch and went directly to the nvr from one of the poe's with a different cable with no change.  I reset the nvr back to default and still no devices.  What would cause the nvr and the p.o.e's to loose connection?  How might I fix it? lol  Thanks so much in advance