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I was trying to compose an email. I don't know what happened, but I became stuck. I think I put the tablet on standby and the next day tried to continue. The first thing I noticed was a padlock on a black screen. I now see that when I try to open some apps, I get a black screen and when I try to type in anything, the keyboard seems locked. What do I do to extract myself from this problem, because I can see emails, but cannot open them, or key anything? I have been trying anything I could think of, but being a novice at emails and apps is getting me nowhere so far. Thanks for any assistance as it took me 4 days to figure how to look for and get to address this forum.