HELP : Ray Sharp CCTV ( Grey Screen )

[Dorky 0]

Greetings! I'm hoping someone could assist me regarding my situation. Any feedback is greatly appreciated.

 

Brand : Ray Sharp

Model : Not Sure

Situation :

This CCTV was configured by the shop but they are not helpful and blaming me for the error. The system was working fine for about a month or so but recently I had encounter a problem of grey screen after entering the password. Below is the screenshot of how it looks like. Usually after entering the password, it should show 4 chn video.

 

 

Please advise.