I need to start this by saying I'm not a noob. I may be new to android and I don't spend much time (any) with linux, but dammit! I know... stuff! I rooted my SCH-r720 last week. Everything was fine until today. I restarted the phone, got thru the MetroPCS animation, then the SAMSUNG black screen and then.... that's it. So either something I installed today is preventing it from booting, I installed lots of security apps and ProLauncher. And I did a stupid stupid thing. I deleted poweron.wav from /system/etc and forgot to replace it, then restarted my phone and consequently broke my own damn phone. Got the phone into recovery wiped data. Nada. Still won't boot. I poked around with QtADP a bit. Got ADP and tried replacing the file, I get permissions denied. I tried to remount, denied. Help?