I bought my T715 just a few months ago, earlier this year. Since yesterday after my battery went flat (i have fully recharged it since) I was not able to turn my phone on successfully - it gets stuck on the Sony Ericsson logo start up screen and i cannot turn it off without removing the batteries. If the sim card is taken out, it will start up and turn off but you can't use SE phones (except view the Demo video over and over again...) without it. I have confirmed my battery, memory card, charger or sim card is not faulty. I don't think i'll be able to get it repaired under warranty as I'm not too clear on where my proof of purchase went. Do you guys know of any solutions? If not, approximately how much would it cost to repair?