Actually the reason why I ask this question is that the scenario actually happens to me. Take here for example
allabout[dash]aquariumfish[dot]blogspot[dot]com/2007/12/freshwater-tropical-fish.html
allabout[dash]aquariumfish[dot]blogspot[dot]com/2007/12/reef-ready-aquariums.html
both has Page Ranking 2 but the main page allabout[dash]aquariumfish[dot]blogspot[dot]com
is Page Ranked 0


I was a bit confused here. Both internal page actually has no backlink listed but they get high Page Ranking compared to the main page. Did I do something wrong here? I need advice. Thanks