There was an information that why adsense ad code after pasting correctly not showing ads.so then this information is for you and you are on right place.
It is because adsensce first check your website review if it is approved then you have no problem but it not then ads will be shown untill it approved
For approving you have to send application for review you will search blogger help how to send  website review application in adsensce.once the adsense approve your request your ads will be shown.