I haven't got the correct connections to test the cameras independently but I'm sure they are working. The fact that it's displaying an error message on the screen at all times makes me think it's the DVR.
I don't have the disc that came with the DVR, so system restore is not an option. I have reset the DVR back to manufacturer settings.
This is why I really need to identify it, so I can download the correct system update and get it working again. I have checked online and I can't find a picture of it on any of the manufacturers you guys have mentioned
Any other options ?