My 6 month old CMP749 was working fine until couple of days ago when during use the screen went black. Thinking the battery had run out I put it on charge overnite. But it fails to turn on. I have tried holding the power button for a longer period, pressing the power and volume + buttons simultaneously several time or tried to reset it but nothing works. It looks like totally dead. Will appreciate knowing anything else that I can try which might bring it back to life. Thank you.