Google AdSense does not place ads on your page immediately, because they need to [insert weird Google function/policy/thingy here] in order to figure out which ads to serve to your site. This can take anywhere from 1 day to 1 week.
Somewhere, deep within your Google AdSense options (on Google, not Graphene), there is, or there used to be, an option to show public service ads if no regular ads are served to your site. At least that way you would know that things are working on their end. You might want to look into this.
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