Depending on what you flashed, you may have to get (worse case scenario) a download jig. They're easy to make if you got a solder iron. Google Samsung download jig or search xda for the how to make.
That's if you can't get it to go into download with the battery drop in trick.
---------- Post added at 04:52 PM ---------- Previous post was at 04:50 PM ----------
And btw, hard brick is a phone that does nothing.
Try a different cord to, some of the cheap phone chargers won't work (unable to transfer files, etc)