HI guys i have exactly the same problem but my bootloop was caused by installing recovery through the cwm app and then rebooting to recovery through the app. i rebooted to recovery with an app before and it caused this aswell ...however back then my volume down button was working
. i fixed it last time by going into download mode and flashing philz recovery however i cant enter download mode or recovery or boot into system.
PS: my phone doesnt boot into recovery it comes up with the samsung galaxy s3 gt 19300 logo then it comes up with the cwm recovery icon in the middle of my screen and 'clockwordmod recovery v18.104.22.168' at the bottom of the screen then restarts itself.
i dont know what to try i have looked around, didnt want to create a new thread just wanted to find out if anyone has any idea of what i can do except for buying a new volume down button thats my last resort apprently its £35 to fix
easy way to fill up you thanks meter guys as any sort of input and advice is extremely appreciated.