Hi. Your system is a hybrid analog or IP.
Under system settings click on camera and in middle of screen you will see analog IP or DVR ....... Click on each camera at top of screen and check analog is picked ....
Also then BNC leads this will give you problems if not in the right connector on your card.
You should have two leads and one will have a yellow phone out ...(this is only on 1 lead ) and should only be in the top connector on card.
It is the lead with the yellow phono i'm having issues with.. currently connecting via BNC to the BNC input however I think at one point it was connected to the white phono using a phono to bnc adaptor?