I'm wondering if anyone would have any idea how I could fix this (if it's even fixable). I'm pretty sure the model is Samsung S4. I have googled a few things and some results were that maybe there's a loose flex ribbon cable. It doesn't turn on without being charged at this stage (so I guess the battery is stuffed too), but all it shows is a permanent static like screen when plugged in. I did try and 're set the phone a couple of weeks ago but whilst downloading the android stuff it froze and I had to turn it off. EDIT - Charged it for a bit. Turns on without being plugged in, so it seems to store charge in the battery. No change to the static screen though.