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There is a reset button that if pressed will power it down. This might also jar it into doing what it is supposed to. On the pocket edge it is next to the usb jack (big one). It is marked. Push an unbent paper clip in till you feel a little click and it should power down.
What you had and may still have is android 1.6, if it upgraded you may have 1.6 or as some of us have still 1.6.
I've been unable to download the 2.2 as mine tells me I have the latest. I plan to do the manual upgrade later.
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