sighs.. there's too many pages for me to search for it so i apologise if anyone's posted about this before. My 5800's had this problem where i can't unlock it and so it's either always locked or always on (in this case, the battery dies damn fast). Another thing is that the screen shows vertical colourful lines that flash until my phone dies. It can't stay on for longer than about a minute... =/ Sent for repairs and they changed the screen but no difference. I've googled it and they say maybe it's loose battery connecters. What do you guys think?