hi Folks, I have a Kguard CCTV system (H.264 I think). It has stopped working. Based on my checks thus far, I suspect the motherboard has failed. The cameras are I believe all OK and I do not want to install new cameras. The specs for the cameras say they are "420TV lines". Newer systems I am looking at all refer to 720P, 1080P, etc. Can anyone enlighten me as to whether my cameras might be compatible with these newer controllers?