my website suddenly went out of google index, it is doing ok on Bing and Yahoo, but something wrong with google. My pics also did not indexed by google. Previously it ranked high on the first page, content is unique, but I change hosting from GoDaddy to Hostgator and changed WP template, Alexa ranked dropped too and continue falling down. Where can be a problem? Can it be connected with panda? How I can analyze it and find out the reason?
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That's quite easy. you can request Google webmaster to reconsider from here https://www.google.com/webmasters/tools/reconsideration but do make sure you do know why to reconsider ..for this please watch video..you can find in this page. http://www.google.com/support/webmasters/bin/answer.py?answer=35843
If you did nothing wrong then submit your site for reconsideration . Changing host or template can not ban any site . and panda is related with law quality content .
If you build too many backlinks at once or google indexs 100 backlinks for one of your sites one day and 0 the next for example. This is basically telling google that you are using blackhat methods to get backlinks and they will sandbox (unindex you) you. I don't know if this is your problem but it could be. If you do get sandboxed it usually takes atleast 6 months to get indexed again.
If your site got sandboxed, its not because you changed host, its because you build far too many backlinks at once and Google picked it up as spam and thus banned your website for illegitimate backlink building!