Vantage CCTV system... I've hit a blank

[StkSprk]

If anyone has any ideas i would be grateful...

I dont know much about Cameras so but i am currently trying to repair the old CCTV system at work. I have replaced a faulty transformer but all four Vantage CC620DC cameras seem not to be working. i am recieving a 'No camera' message at the display router.

Can you offer any advice as to how to fix the problem. I am aware that the cameras are old but i cannot find any damage. Could you offer any ideas of how to test what is wrong. Is there a way to reset the cameras? I am told that they all stopped working at once which is why i changed the transformer now i am at a loss.

Any ideas are welcome...

STKSPRK

 

[NozSpark]

Are you getting any power at the cameras? I've found that some people install "diy"able systems and then don't put the plugs/sockets in an enclosure,,,, water gets in the plugs and tracks up the cables causing permanent damage.