Assuming you site is being indexed, but your particular webpage isn’t, it might be time to check your title tags to ensure your not accidently blocking search spiders.
Avoid accidental blocking of the Google spider by ensuring that your META data doesn’t look like this:
2:30-3:00 – Check for a bad Rel=Canonical tag
The problem comes when you canonicalize too narrowly. Let’s say for example, that every page on your site had a canonical tag with the URL “www.example.com” – Google would take that as an instruction to collapse your entire search index down to just ONE page.
In some cases, a page may be returning a bad header, error code (404, for example) or poorly structured redirect (301/302) that’s preventing proper indexation. You’ll need a header checker for this – there are plenty of free ones online (try HTTP Web-Sniffer).
Although you might share content across multiple sites, once Google detects these duplicates, it’s probably going to pick one and ignore the rest.
One pretty easy to spot problem is when you have a pattern of suspicious anchor text – usually, an uncommon keyword combination that dominates your inbound links. What you’re looking for is a pattern of unnatural repetition. Let’s say, though, that 70% of our links pointing back to SEOmoz had the anchor text “Danny Dover Is Awesome.” That would be unnatural. If Google thinks this is a sign of manipulative link building, you may see that target page penalized.