why is my mobile suddenly dead when flash rom time

My android phone is dead when while flash rom time. It is not starting up & not charging while charger & data cable are.

when try to on it, it couldn't start. I try to charge it but it was not showing anything(usual battery symbol). I left it on charging for 5-6 hours & again try to on it but it couldn't start.
It is not showing anything like welcome screen. I tried power button+vol. up/down key but nothing happened. please give me a solution...plz

Please help what to do.
Phone details are:
Manufacturer- samsung s duos
Model - s 7562
OS - 4.0.4

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