I moved (temporarily my Q-see QCK-81 NVR from a location that had a 4K monitor on HDMI. Everything worked fine when it was hooked up to a 4K monitor. When I moved to a new location, the monitor that I have now is a 1080P. Since I forgot to set the resolution back to 1080 before I moved it, I can only see the initial boot up screen and then all goes black. There is no button inside to reset it to factory specs and it appears the only way to do this is to bring it back to the location that has a 4K screen to change the resolution back to 1080P. Any ideas?? --Greg--