HELP!!! iPhone cant go back to lockscreen!

hey everyone, first post here please, bear me

iphone 3gs cant go lockscreen unless press power button. in settings - general - auto lock set 1 minute... after few seconds without touching iphone screen goes black when tap screen or press home button goes , not lockscreen... please !

thanks,

megahalems

 

question:

1. lever brightness set to?

2. happens if wait full minute (rather few seconds)?

 

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