Display not showing now


I have a ZMD-DD-SBN8 and it has been fine but I see now the motion has stopped.

I took the monitor and cable to another PC and they both worked is it is with the zmodo.

When I turn it all off then start I get the Blue ZMODO logo and then a few flashes of the 8 cams for a few secs then nothing.

I have tried a few things but si far no go.

Can you help please?