Google not indexing

I have my domain www.neomicron.com from 1997 but I forgot to renew it in Jan/01 and renewed it in Apr/06. Ever since google crawls my site everyday but does not index anything. I spend over $3500 on google ads and still no indexing. The funny part is google gave me a PR of 3 when not even one page of mine is indexed. Indexed on yahoo, msn, and over 500 directories, yet google nothing.

Can anyone explain why nothing is getting indexed?
Should I be doing something, that I am not doing?

Thank you

 

maybe your site is banned?

 

how can i check if my site is banned or not?

 

Email Google Search support about it and ask why you're not being indexed or submit your sitemap to see some details.

 

The funny thing is I emailed them about 2 months ago and yet no answer.
I had over 350,000 pages indexed before and PR of 7. Now 0 index and PR 3.

 

http://www.iwebtool.com/google_banned

What did you use to have on that domain? Whatever it is, Email google and ask them

 

www.neomicron.com/robots.txt this could be part of the problem

 

404 - Page not found is the problem?

 

Sometimes when you rush into things you forget alot of things, which in my case is I am trying to do the programming, designing and the rest of things in one shot.
Thank you everyone for your kind comments and pointing some of errors. As I know most of us here us dynamic pages and w3 validation is very important to us. I looked into that last night for about 9 hours or so, until I found the some of errors and fix them piece by piece.
I will post some of the new things that I found, which will be helpful to some other admins.

Once again thank you for your feedbacks.

 

Fixed the robot part, so it should be working now.

 

Sorry I am not getting it, what is wrong with 404 page, if you can please explain this.

Thank you

 

That question was directed at tork

 

You should probably try implementing sitemaps and then log on to the google sitemaps to see what issues the google crawler has and address them.

 

after you've made the changes, you can use this link to check

http://www.google.com/webmasters/sitemaps/sitestatus

 

A robots.txt file is only meant to exclude directories from search not include them. If it is missing the spider will assume the entire site should be indexed. Keep in mind that this may not be the case for dynamically generated sites as spiders will attempt to avoid being caught in loops. Many sites especially online stores have this problem which is why a site map can be invaluable.

 

Use google webmasters tools, it gives you any problem with the site has. If not, it'll be finne indexing your site..