Hi. Have problem with my iPhone 3GS (model MC131B). If it is switched on from 'off' then it starts fine. It shuts down after a minute but, if I then switch it back on I only get a white screen. I have to reboot it completely, then it restarts properly again. Current software version is (if I'm reading this right) 5.1.1 (9B206). Any suggestions gratefully received.
Level of technical knowledge - moderate to poor
Level of technical knowledge - moderate to poor