I bought a new Nokia phone N900 and I purchased this around 2 days before. It was functioning so well yesterday, but I do not familiar what is happened in to this. I altered it to put the memory card in it and later insertion, when I tested to begin the phone again, I was not capable to acquire succeed in this. Just vibrates once and then that depicts me the black display only. I tested to do this many times but all time it depicts me the similar thing. Please tell me how I can set this trouble.