There are a few details that need to be listed in order for someone to help.
- How old are the drives, drives older than 2.5 years of age need to be replaced with a Surveillance Type Drive.
- Are the internal fans working? especially if the CPU fan has one and it's not working then the recorder will need to be replaced. It will soon fail completely.
- Is the Power Supply adaptor working properly? 12VDC should be seen at the end of the barrel connector.
- Was it just the monitor or the recorder itself, in many cases the monitor or HDMI cable stops working as it should.