I have Samtron 51s monitor bought in 2001, which has stopped working properly. When I switch on my monitor, colours and resolution are OK. But after some time it starts flickering, colours get all wrong, and images look like being taken using thermal scan.
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It sounds like your video is set to the wrong resolution. Try booting into safe mode by pressing F12 at the start of the boot process. If you get into windows that way, then adjust the display to something you monitor can display like 1024x728@32bits. The monitor can only display a certain amount of pixels and if you set the video card to high you will lose visual. Hope this helps.
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