Samsung Galaxy Note Pro 12.2 won't go past Samsung logo to reboot

I have just replaced the battery pack, charging port and ribbon on my Samsung Galaxy Note Pro 12.2 device as I had been having screen flicker, random reboot and charging problems (God bless utube tutorials!) This seems to have solved the charging problem as I was able to charge the new battery successfully (still without turning it back on)

However, whilst I was doing the repair, I also disconnected the LCD ribbon cable in an effort to make sure that it was seated correctly in both ribbon connectors as I had seen that sometimes the bottom connector (under the tape) snaps up after tablet has been knocked (which mine has)which causes other issues.

I found it quite difficult to get the LCD ribbon back into the holders and had to flex and bend it quite a bit in the process. Now when I switch on the device it knows what it is (as Samsung Galaxy Note Pro 12.2 appears on the screen) then it goes to the Samsung logo but won’t boot up past this point. I can also display the odin(?) screen when I press the on and sound buttons together. I can also cancel the odin screen with the sound button.

Any ideas what I should do next? Or should I just end my foolish endeavours and take it to someone who knows what they are doing with these devices. Am hoping I haven’t totalled it with my fiddling!

Any helpful suggestions gratefully received.

Many thanks’


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I should also say I can't now get the darned thing to switch off!