Last night at 8:30 pm all networked 7 cameras on Blue Iris were online and displaying fine. This morning at 6am when I looked all cameras had black displays giving errors saying check ip/password etc. 1st I rebooted the Motorola Surfboard 6580 Router ... no help. Rebooted BI no help. Rebooted the computer, no help. Did a computer Restore to about 3 days ago, no help. Since the local LAN is also failing to reveal the network I deleted the LAN driver files on my computer/server (long shot) and rebooted, no help. Then deactivated BI, and then moved a 2nd computer system here in it's place and installed BI and imported the reg file ... nothing .. all black. Checked with Advanced IP scanner and ONVIF and no cameras are showing. Rebooted all the ProSAFE 8-Port Gigabit Switches (3 ) and also the last in line a 4th, a Linksys POE and checked to see if that helped ... no help. In desperation I direct wired (Cat5) camera in the computer room to the only port left open on the Surfboard Modem and I was able to bring up that camera .... 192.168.0.200. So it appears to this novice that nothing is getting past the Gigabit Switch? Or maybe incorrectly? Out the modem ok but not out the switch ok. The Router ports used are: 1: To Computer 2: To NetGear GS108v4 Switch 3: A Second Office Computer 4: Brother printer. I have 2 computers downstairs that also do not see the Internet. My wifi on the laptop and cell phones are fine. In the back of my mind I remember a longshot something about using ivp4 .... but I think that was when you have "Limited Internet". Anyway ... I'm grasping at straws right now as I have no network and no cameras. Logically it seems that the Gigabyte 8-Port Gigabit Switch (GS108v4) must not be passing the data correctly. ??