Recorded list not available.

Does the DVR power on and work?

Done it and it worked, thank you.

I tried this and it didn't work for me.

So if you had power outages that flashed on and off, and it says "recordings are unavailable", just flip over all of your DVR/cable boxes and look for a code like ISB7000- this is the code for those "other rooms", not your main box. No matter what you were told by the installer, you must find the one in your house that is different from all the "others". Look for anything that has an "H" or other numbers.

Simple solution. Once you find the actual "home unit box" and reset that "one with the different letters and numbers", then it will fix all your problems. Just the 10 second power button reset, no need to do anything else (you can skip powering off the whole system, each tv and WiFi completely).

Just that little home box you didn't know was declared the hub - reset it and you are golden!

Look on the FRONT of the receivers for the brand and model number.  The DVR will have a different model number than the STBs. 

Also, the DVR is always hardwired to the Gateway (ie. modem) and most likely is near the gateway for that reason.