I am having the same problem. I will try later today to plug it into a normal monitor using a 15 pin VGA cable. after that I have no idea.
You need to install the CMS Software that came on the little CD with the DVR, the settings you need are under Remote Config then GUI Display. In the menus thee is an option to change the reolution back to what you want then press OK. After rebooting you should be good to go.
Another alternative is to use a VGA able to connect the DVR
Floureon H.264 DVR Factory Reset
in Digital Video Recorders
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You need to install the CMS Software that came on the little CD with the DVR, the settings you need are under Remote Config then GUI Display. In the menus thee is an option to change the reolution back to what you want then press OK. After rebooting you should be good to go.
Another alternative is to use a VGA able to connect the DVR