Question about Sony Ericsson K790a Cellular Phone

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Cannot turn my k790a on...

My phone was working ok, i didn't drop it or something like that. I just turned it off for night. Then I am not able to turn it on. When I press the "power" button on the top of the phone InfraRed port is blinking with a red light and that's it. I thought I had ran out of battery power. When plugged the charger in, the same problem, InfraRed port was blinking with a red light. It cannot even recharge. I got another battery of the same type, but the same thing is happening. I tried to put another SIM and I also tried without any SIM card, but no help, same thing.
What could be the problem?

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