I registered my site a month ago, and appeared in google search result of focused keyword. The ranking is not so bad, my site placed in 4th~5th page when google results have 9~10 pages. But after 1 day the ranking falled 4~5 pages. So, my page appeared in 9th page. In some computers, there is no my page in SERP. Of course, I didn't take any Black-hat SEO. Is my site penalized by google? Can my site increase ranking again?