That's one of the risks of rooting your device: lack of support.
I would start with a complete new install. If that fails, go back to the original Samsung software. If that fails also it's a hardware issue, but with the original software installed you might still have warranty.
I don't know if this is the right place to post this, but...
So I was trying to edit the buttons on my Tmo Galaxy S3 (with AOKP Milestone 2) and accidentally broke all of them. They don't respond at all now.
I went into system/usr/keylayout. I copied the files to my sd card. Then I edited them (I also kept a backup of the old files). When I was finished I went back to the system/user/keylayout section and pasted the new files. As soon as I exited the file browser my phone reset itself. When the phone came back on none of the keys worked.
So I deleted the files I put in, and replaced them with the old files that were there before (using pie controls to navigate). I reset my phone using the app Quick Boot because I heard you have to reboot your phone in order for the new software coding to take effect. But still none of the hardware keys work.
I don't understand. All of the original files are there now. I'm afraid to let my phone die or to even turn it off because I don't know if the power button will work anymore. To wake up my phone I have to plug it into the charger and then use pie controls to navigate. Can any of you help me?