I have a forum with subdomain my main domain is now PR1 but my forum is 4 month old and 24 hour google bot indexed then why it show PR N/A?? I got lot of traffic from google search engine and total bacllink 235.Will u check it please what happened??my forum url is http://forum.hostmela.com
Outbound links are more than your inbound links. It may be the reason? more over i checked your back links by manually and with tool. It shows no back links pointed your website.
PR is calculated based on many things - you can't predict PR - because its Google's own algorithm - it was calculated by so many factors. As u said, your site is only 4months old - keep doing link-building for that. I just checked - your site was crawled by Google today (Nov,. 18) - that's the cool thing. Personally, I feel that, you are getting good traffic from Google and getting frequent crawling - then you cares much for PR - its just a factor by Google. PR is not having any influence on SERP ranking - so forget about getting high PR and work for getting high number of visitors.