k800i wont turn on !!!?

Hi, my k800i is giving me hell. One minute it would turn on and then turn off. So i thought it was the battery and purchase a new one. This didnt solve the problem and after a few days when i press the ON button only a white screen would come on then go off. But then i wasnt even able do that anymore and had to it put on charge. To get the white screen to show again, only for it to go off and the IR light to start flashing. I read on the internet that when this happends its easy to fix with flash drivers. But now i am at the point where its DEAD i get nothing. Even when i plug it into the computer with usb it doesnt come on !!!