Hi!
Alright, did you do the power reset? Take the battery out. Press the power button to turn it on without battery in it, then place the battery in, charge for 1 minute and try to turn it on again.
If this doesn't work, check the battery pins on the motherboard. Are they still fine? Not budged or something..?
It also could be that 1 of the fuses are broken on the motherboard... You can test this with a multimeter - continuity test.