If it's a new site, you are probably stuck in the Google Sandbox. A site that is Sandboxed will show up using the "site" query, as pointed out by Avi, but it will not rank well for any competitive phrases for 5 to 8 months, and sometimes up to a year.
If it's an older site, it may be heavily penalized or banned.
Reputation Points: 15
Solved Threads: 5
Junior Poster in Training
Offline 87 posts
since Aug 2005