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Try holding down the home button while pressing and releasing the power button.
All that does for me is bring up the task manager (while pressing home button) and turns the screen off when I press the power button. And yes, I continue to hold the home button while pressing the power button.

Sorry about that. My wife's phone is the E4G, and she doesn't have the GB OTA update yet. I have the E4GT (Gingerbread 2.3.4), and that's how you get screenshots with it. I'll dig a little when the E4G update happens. I think I'm going to do it manually. Wish me luck!![]()
All that does for me is bring up the task manager (while pressing home button) and turns the screen off when I press the power button. And yes, I continue to hold the home button while pressing the power button.
i have the Xperia Arc (gingerbread 2.3.4), and i had to press and hold the power button until the second menu came up, and that menu has a "take screenshot" option now. hope this helps!