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Sorry, but this happened to me and it was a motherboard fault. Do a search on these forums for power switch 650. It's happened to several people.
It seems the power-switch is integrated in the MB and when it goes the whole thing goes. It's a design fault with the 650s. A great shame because otherwise its a great device. You may as well hit ebay and get an old 650 or get a T1. You can find them cheap now.
For others, if your 650 is still okay, I recommend you minimize all use of the power-switch. Install the latest version of Prs+ and instead of using the standby / sleep mode, turn that off, and bind a key to turn off the touch screen instead. Basically, minimize all use of the power switch.
Personally I will never pay more for quality for ereaders. They are disposable. I buy used.
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