[zorrophreak]

Let me try to help. First thing, we'll assume that you are on a stock rom. If you can enter recovery mode, then use software such as Odin to restore (plenty of tutorials online, I don't own a Samsung anymore so I lost most of my knowledge. Using basic android knowledge now). If you can't do that, tell me this:

Model #:
Carrier:
Is your ROM Stock:
Do you have custom recovery:
Are you rooted:
Do you have busybox (sounds irrelevant but it bricked my old tablet):
Have you unlocked your bootloader:
When you connect to your computer, does it come up and if so what does it say:

Let us know and we can try to diagnose and fix from there. But definitely seems like a corrupted bl, a corrupted ROM, or a full on brick. Like @heart said, if you could record this happening in real time, it will help a lot