as already suggested, i would check your tv first.  ensure you have selected the correct INPUT on your tv.  this option should be on your remote control, and it will scroll through all the inputs available to you on your tv: ie cable, hdmi, hdmi2, etc.  

what make/model of tv do you have?

if you have confirmed the above, then i would suggest that your tv does not support blu ray HD, 1080p.  again if you google your tv specs, you'll find out.

good luck.