mobile

I searched and found nothing exactly like what I was experiencing and nothing I hadn't already tried. Hopefully someone has seen this before. I HAD a nice rooted stock SM-G900A 4.4.4 and now I have a flashy gold brick (soft). I rooted by downgrading the kernel to use towelroot then flashed stock kernel back. Everything worked fine for about a week or so. I'm not sure at what point I started having issues exactly so I'm not sure if an app or mild mod could have caused my issues. The only thing I had done was use SuperSU to block Knox and change the terrible TW stock sounds to standard ogg clicks and what not. The trouble started with the camera. I opened my camera and the screen would flash green then I would have red ghost images in a pattern on the screen. The pictures I took had the same effect when viewed in the gallery. If I switched modes the problem would go away with the camera until I closed then opened the camera app again so I assumed it was a software rather than hardware problem. I couldn't find any info on a fix so I did a factory reset. The problem persisted. I decided finally to flash back to stock. That's when it really got bad. After flashing to stock the phone will boot to the Samsung animation with the swoosh, freeze there for a few seconds without completing the boot animation then the screen shuts off and the phone becomes unresponsive. The only signs of life is the blue LED is constant lit. I have to do a battery pull to start over. I have flashed just the PDA and I have flashed the whole shootin match (except for BL) and I get the same results. I have tried stock tar files from a couple different sources. It will go into download mode as well as stock recovery where I tried a factory reset after flashing. PLEASE HELP!