Blinking power/rec light and clicking noise.

My DVR's blue power light and yellow record light are blinking, accompanied by soft clicking sounds. I've unplugged it, leaving it unplugged for a day. I've pressed the reset button. I've verified that everything is exactly as the installer had it. It was working fine the first two months, now, just blinking and clicking. We have had no power outages or surges, and no other trauma. Does anyone know what this could be and how I can fix it? 

Thanks for any help.