That's a harder question, because it brings up the spectre of the "permanent zero".
Permanent zeros are domains that, for some reason that has yet to be determined, stay zeros no matter what you do to them, even tho they are clearly not banned, and their pages do still stay in the serps, just never placing very well.
All the permanent zero's I know about are older domains, from 2001 or earlier.
Bottom line is there is no way to know for sure wether any specific domain has a "permanent zero" without watching it over time. (and there's a lot of dispute over what perm zero's actually are... I suspect they are an old penalty google once applied, but no longer uses.)
If it's a newer domain chances are it just has no good backlinks. Check its backlinks- if the existing backlinks should have given it a higher pagerank, be a little cautious.
Only way to know for sure is to give it some good backlinks and watch it over time. Since "official" pr is only updated a few times a year now, it takes a while for this test to work.
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