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I think you mean that your phone is stuck in a loop or at the Sony Ericsson screen?

The best thing to try is running a repair via Sony Ericsson Update Service

Sony Ericsson - Support - Phones - Topic - Updateserviceapplication - Xperia? X10

This will factory reset your phone and hopefully sort the problem out. Make sure the battery is charged before you start. It will wipe all contacts/sms etc from the phone memory but hopefully you have them synced or a backup to SD card done.
 
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