Blew into shoulder buttons , Now DSi won't turn on at all?

Theres an old trick for dislodging dust in the shoulder buttons where you just blow into them. I've done it hundreds of times, but this time when I went to press them to get a response, the console shut down completely and won't come back on even with charging and battery replacements. The blue power light blips once and then off again. What did I even do and how do I fix it?