"It only boots up when connected to the charge cable" is key.
This means that your battery is not connected--which may explain most of your other problems. Hopefully, you just need to reseat the battery, but it is very common to actually tear a solder connection of the battery connector to the motherboard---can be repaired, but you may wish to seek a professional.
The dark LCD is most likely not connected properly, or the connector is damaged. Take a look carefully at the connector under magnification, clean the connector, and try again. The original problem (blocks at top) is also caused by a connector misfit.
You can try connecting the old screen lcd only and not worrying about the digitizer.
Good luck
Jessa
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== Update ==
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PS: the bong noise is the phone prompting you for input that you can't provide with the screen non functional
"It only boots up when connected to the charge cable" is key.
This means that your battery is not connected--which may explain most of your other problems. Hopefully, you just need to reseat the battery, but it is very common to actually tear a solder connection of the battery connector to the motherboard---can be repaired, but you may wish to seek a professional.
The dark LCD is most likely not connected properly, or the connector is damaged. Take a look carefully at the connector under magnification, clean the connector, and try again. The original problem (blocks at top) is also caused by a connector misfit.
You can try connecting the old screen lcd only and not worrying about the digitizer.
Good luck
Jessa