A friend just recently purchased a sunluxy h.264 network dvr. without a hard drive. 
  
Im having a basic problem in which my pc monitor is connected directly into the dvr and i can see the screen saying no signal for the 4 camera views. 
  
I have 1 camera connected but its not showing me any video at all. Is it because i dont have a hard drive connected even though i dont want to record yet i just want to see the camera in action. 
  
Why is this? Someone please help.