Google Cache Date

Hey guys I have a site that is about 2 years old now and it used to have a google snap shot of cache date but now it doesn't show. If I go to Google and type in site:www.mydomain.com it shows all the pages that are index within my site which is about 1,000 or so. Then if I type in cache:http://www.mydomain.com it says - did not match any documents. Also I notice that the number of index pages from 1000 is going down lower and lower each day.

What can I do? Can this domain be saved?