Usually, when you connect DVR to power source with adapter, monitor will show H.View logo about 10 seconds. Then you will hear a beep and see video of camera(if camera is connected) and setting panel on the screen.

If it enters the procedure to H.View logo or its stays color mode, the system doesn't power on successfully.

Please try methods below.

1. If you are using HDMI port on DVR, please try VGA port if you can.

2. Unplug adapter and plug again for several times.

3. Try another adapter.(camera's adapter can be used for DVR)

4. Unplug all cameras.

5. Uninstall hard disk drive if it is pre-installed. Here is method:

https://hview.kf5.com/hc/kb/article/1032594/?from=draft