My DSi XL won't turn on after cleaning the right and left buttons

Hi guys! I had yesterday cleaned my nintendo dsi xl and mostly i wanted to clean the right and the left shoulder buttons. I did that in the first place and then i turned on my dsi xl. Then it powered on completely good and i checked them. One didnt work and then i teard it down again to reclean it but after that i cant power it on. When i put it to charge it has the charger icon blinking and it is not a battery problem as i have tested the battery in other dsi xl’s and it works completely fine. Can you help me?