Fujifilm F72 EXR help ?

Long story but my fujifilm F70 EXR camera that i bought for £200 in january had no problems until my little brother spilt bubbles on it i opened it up myself with special tools and cleaned the screen put it back together and it worked but it had a spot in the bottom corner so i opened it all back up to clean this part and then put it back together but 2 screws went missing and after putting it back together the best i could it then wouldnt turn on i have made sure the battery is fully charged and it just wont turn on, what do i do :( please help