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If you have Samtron 56 V monitor that sometimes switch ON for 10 to 15 minutes, then it is a signal of some internal device fault which needs to be rectified from certified hardware technician from monitor manufacturer service center itself. It is recommended to directly contact Samtron for hardware replacement if it is under warranty or ask to repair it.
Not all DVRs have WORKING VGA output. I used to work for Nuvico, and we had 2 different versions for DVRs. Ones with VGA connection. The other with non-working VGA connection. VGA port itself does not guarantee.
Some DVRs also have DIP switch in the back.
You can simply toggle between composite or VGA output. Ones with DIP switches often require reboot, and from my experience these do not work well with VGA monitors.
Also... Make sure VGA monitor support low resolution. Stand-alone DVRs' native resolution is either 600 or 800 horizontal lines.
It will help alot if I know the model of DVR/CCTV