Hi All, I had purchased a new GS3 on July, 4 months ago. the phone seemed to work just fine for the first 3 months, then it sometimes just shut down by itself, i thought it was something that i did or a battery problem so i did not give it so much attention. on October 30 the phone suddenly shut down and since then will not turn on, if i connect it to the power the following caption appears "Galaxy S3 i9300" and that's it. can you please advice what can cause such problem? I was suggested it might connect to the motherboard? Hope you can suggest the reason since the place from where i purchased refuse to help and avoid replace it.