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Hi, that is strange....normally as you say you press/hold a blank space on your screen....said screen 'shrinks' up to reveal 3 large icons at the bottom, WALLPAPERS/WIDGETS/SETTINGS....have you tried doing this in differest areas, is your touchscreen working perfectly well? Try this again in Safe Mode first......
http://talk.sonymobile.com/t5/FAQ/How-to-boot-your-phone-into-safe-mode/m-p/348008