Since I could not power on my Razr M by whatever way, I gave my phone for service in Chennai, Firstcall Technologies.
Thank god, they readied my phone in 1 day. They said there was problem in power section. Moisture had entered and affected it.
Actually on the problem night, I had kept it charging in a AC room in a hotel. It was an old ac and I could remember moist air coming from the ac. As the phone was getting charged near the ac, moisture might have gone in and affected.
Luckily I got back my phone in perfect condition and I was charged Rs.1600