DVR MPEG-4 9CH "stops working"

[mcdronan 0]

Hi guys, this is my first post..so forgive me if I'm a bit clueless on replys....

 

Nov 2009 I bought and installed for my shop the DVR Model MPEG-4 9CH and up until this week I had no problems. I went to switch it on the other day and all 9 cameras are appering blank on the montior....

 

So I checked the grey fuse box and all lights next to fuses are green. I changed all the fuses anyway..

but still no joy...The Hard drive still has all recordings stored and I can play these on montior.

 

Any ideas where my problem might be??

Thanks in advance