IF YOU OWN A SONY ERICSSON "ARC S" THEN I KNOW THAT THERE IS A LOT OF THEM WITH A KNOWN BUG THAT STOPS IT FROM TURNING BACK ON, I HAVE SENT MY PHONE IN TO THE SHOP AS ITS ON CONTACT AND THEY COULDNT FIX IT??? SO RATHER THEN ASK ANYWHERE ELSE I FOUND THE SOLUTION AND HERE IT IS: OK THE WAY I FOUND IT WORKED WAS TO SIMPLY TAKE THE BATTERY OFF! THEN TAKE OUT UR MICROSD/STORAGE CARD LEAVE IT FOR TEN SECONDS THAT WILL WORK I THINK THE PHONE HAS AN ISSUE WITH THE EXTERNAL MEMORY..STRANGE I FIGURED IT OUT YET IT TOOK SONY 7 DAYS TO SEND MY PHONE BACK THAT STILL WASNST WORKING?? HOPE THIS HELPS IT DID TO ME AND A FEW OTHERS!