HN has guidelines linked at bottom

  Please don't post on HN to ask or tell us something (e.g.  
  to ask us questions about Y Combinator, or to ask or 
  complain about moderation). If you want to say something  
  to us, please send it to info@ycombinator.com.

a YC'er or a mod will get back to you - basically moderation questions and complaints are off site until/unless meta.news comes along (which will be surprisingly boring as a site)

Anyway that's the fastest and best way to find out if you are being blocked and to plead your case

Good luck