Galaxy Note 4 "boot loop"?

I'm guessing it's called boot loop from research over the past few hours. I switch it on, it loads the logo and phone introduction screen, the screen goes dark, it resets and then repeats. Charges fine, works without charger. I've tried lots from Google results like take out battery, soft and hard reset, recovery boot screen: clear cache, factory reset. I've even tried installing TWRP and rooting via odin which was successful, computer recognised it via USB. I then tried installing a custom ROM and gapps which was also successful but still have boot loop issue. Possible water damage, if so what part will be faulty?