Are you sure it was just seed that you put down and not a feed & weed product? Overdosing with that will turn the grass black, but seed won't do anything to the existing grass.
A quick google turned up some products that contain both seed and fertiliser, names like patch magic, patch fix, lawn thickener and suchlike. I'm guessing overdosing with one of those will do the same as overdosing feed & weed.
If it is fertiliser overdose, it might regrow depending on how bad it is. If it hasn't grown back in a month or so, rake out the dead stuff and put down some plain seed.
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