S3 won't boot up or boot into recovery.

[Yash129]

Samsung Galaxy S3 LTE i-9305

Hello everyone, first post and I need help :crying::crying:
Today I tried backing up my rom on CWM recovery but it was always getting stuck on "Generating MD5 sum"
So I decided to switch to TWRP. I downloaded the TWRP app from the play store. I picked my device, picked the latest
version and downloaded. Then the app asked me if I wanted to reboot into recovery (something like that, I don't exactly remember what it was) and I pressed yes. The phone turned off and rebooted however I don't know what happened but now my phone is starts, shows the [Samsung Galaxy S3 LTE i-9305] screen for about 3 seconds then goes black and again shows the [Samsung Galaxy S3 LTE i-9305] screen repeatedly. I don't know what to do :crying:
My phone is rooted with CM11 flashed. So I can't give it in for a repair as they would be able to tell if I am rooted because of the KNOX warranty void: 1 thing :crying::crying: What can I do now??
NOTE: I can't reboot into recovery, only bootloader.

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