retrieved my blogs but lost my adsense account

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After more than a year of inactivity I have finally decided to visit my four blogs on blogger. I failed during my first login efforts but Google came to help so I was able to get them back. However, when I checked on my adsense account, I found out that it has been deactivated. I wonder if it is possible to reactivate and will it take a long process. I was having my adsense account for years (earning very little actually) but still it was earning. Now, it's gone. Any clues as to what happened or if there is possibility of getting my adsense account back?