Different-Course-671

I have a Zmodo Model: ZP-NE14-S NVR that stopped displaying onto the monitor. I've verified that the monitor and cable are not the issue. I've reset and power cycled the NVR multiple times. Anything else I should try? I'm not very familiar with the system as we just took over this building. What's a good replacement NVR that would be simple to use and compatible with the Zmodo ZP-IBT-S cameras?

What are the minimum requirements to be certified to inspect fire panels and devices in Wisconsin? Do I need on the job training to be certified? The reason I ask is the company I work for manages retirement facility’s and they’re looking to do inspections in house to save money. Thanks for any input.