Just got my HR21 installed today, and it's my first DVR. So far, so good, but had a couple questions.......the blue ring light and the power light seem to kind of "pulse", if you will, instead of just being a solid light. If this is just a characteristic, those of you that have this unit will know what I'm talking about. It's probably the same on the HR20, but figured I should ask to make sure it's normal or not. The other thing is: what is "running" after I power it off. Sounds like a fan or the drive???? If so, why is it running? This is normal? It's my first DVR, so go easy on me if these are stupid questions lol......especially the second one. Thanks in advance!