IPhone 3gs white screen after replacement?

Basically… My iPhone was completely smashed. And one day the glass started falling out and the touch screen didn't work and stuff. Then i replaced it myself (wow) and it had this white screen… Then it started randomly working and i was like yay. But it had white lines on it and it was getting more and more white lines so i was like… Maybe the LCD isn't connected properly so dissabbled it and lost 2 screws (unlucky) but anyway put it back to together and oh a white screen… The home button doesn't work atall so i can't turn it off or do anything
any ideas?
ty x

Yeah buy another phone if you have enougth momey or bring it to an ectronic shop